AudioCircle

Industry Circles => ModWright Instruments (MWI) => Topic started by: modwright on 13 May 2010, 06:02 pm

Title: New Preamp: LS 100 and Options!
Post by: modwright on 13 May 2010, 06:02 pm
Hi guys, we are finalizing the design of our LS 100 preamp, to complement the KWA 100. MSRP is to be $3295.

It will have the following options:

New remote with features including: power, standby, mute, volume, input select, trigger(s).
Balance control (defeatable via front face and remote).
Trigger(s) for amp(s), etc. - controlled by IR remote only.
Inputs Include: CD, DVD, Video, Aux. 1, Aux. 2 and Monitor input.
Home Theater Bypass input.
Tape Loop with Monitor input; Tape out and Monitor input.
Three sets of RCA main outs (no XLR ins or outs - purely SE design).
Headphone Out.

Very prelim. pictures of raw chassis.  Missing are the headphone jack and LED's, but wanted to give you an idea of what it looks like.  On the rear, you will see the OPT. holes without RCA's.  This is an input slot that will be covered with a plate.  It allows us to offer a future phono or DAC board.  The trigger jacks are also missing from the rear view as the boards are not installed yet.


(http://www.audiocircle.com/image.php?id=33130)
FRONT FACE

(http://www.audiocircle.com/image.php?id=33131)
REAR FACE

Professional photos to follow soon.  Units shipping by mid-late August!

Thanks,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: Afterimage on 18 May 2010, 11:52 am
Remote with input select, glad that is offered.  Hard to live without once you have had that feature.  How about the sonics compared to the 36.5?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 18 May 2010, 02:36 pm
The 36.5 is still the higher-end unit and fully balanced.  Design is not 100% finalized, so I can't comment yet on sonic comparisons.

It WILL be an advancement beyond the 9.0SE.  A step forward if you will, at the price-point.

Thanks for your feedback RE options!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 24 May 2010, 12:31 am
I am going to use this thread to ask for feedback from all of you.  I am finalizing the front and rear graphics and have two images here that I would appreciate comment on.

One of the things that people have asked for in our past designs, is a way to know where the volume control is set, from across the room.  One option is a digital display.  The other way is some sort of LED indicator that shows the knob position.  The two photos show what the unit would look like with and without a 2-digit display.

The faceplate is 5"H x 17"W and the control knobs are 2" dia. - to give an idea of scale.


(http://www.audiocircle.com/image.php?id=30727)



(http://www.audiocircle.com/image.php?id=30728)




I welcome your feedback.

Sincerely,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: zybar on 24 May 2010, 12:38 am
Dan,

Personally, I prefer having a LED on the volume and balance controls instead of having a digital display.  My current preamp works this way and I can easily tell where the volume is from a good 15'-20' away.

A nice soft blue LED is more pleasing to my eye than a red LED.

George

Title: Re: New Preamp: LS 100 and Options!
Post by: AB on 24 May 2010, 01:55 am
I like this new symmetry!

Balance? Nice.

As for the Volume display, I am of two minds. I like the elegance of the simple LED on the volume knob but I am not sure it offers the sort of precise feedback I like that would be available from the digits.

The simple LED kills the looks of the digits' faceplate hole - imo.

Will the MW logo light up blue like the amps?
Title: Re: New Preamp: LS 100 and Options!
Post by: Berto on 24 May 2010, 02:17 am
IMO I like two sets of two digit displays for each speaker. Via a button, these can be on all the time or only seen when you make a volume or balance change. More symmetrical.

As AB stated, more precise too. Also agree with George that the blue would be more pleasing to the eye.
Title: Re: New Preamp: LS 100 and Options!
Post by: nrenter on 24 May 2010, 02:36 am
I like the the volume goes to eleven. You see, most blokes, you know, will be playing at ten. You're on ten here, all the way up, all the way up, all the way up, you're on ten on your pre-amp. Where can you go from there? Where? Nowhere. Exactly. What ModWright does is, if you need that extra push over the cliff, you know what Dan does? He puts it up to eleven. Eleven. Exactly. One louder. 
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 24 May 2010, 07:06 am
Well that's right!  When most blokes are at 10....well, we can go to '11'!  It is EXACTLY '1' louder.  Most companies don't give you that... 8)

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 24 May 2010, 07:08 am
Feedback greatly appreciated.  I will see what it might look like with a pair of digital displays - symmetrical.

I prefer the clean look of just the LED's, but I believe that the digits, if done properly, make it quite clear and also deal with the balance issue.

I am struggling with this honestly because in my gut I prefer the minimalist look.  I believe that being able to see where the volume control is, is a good thing, but I guess I expect that the balance would be a set it and forget it thing. Perhaps I am wrong there.

If done without digital displays, then we are dealing with a volume pot and balance pot.  The balance pot will be switchable - i.e. in or out of circuit if you prefer a simpler signal path.  The digital display would mean the use of a digitally controlled, analog volume control (i.e. SS circuit).  This is NOT a digital volume control, but an analog one.  This approach is used by Rowland, C/J and many others.  At this price-point, we can't offer a fully discrete relay driven stepped attenuator approach.

Thanks!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: TomS on 24 May 2010, 11:03 am
Dan,

I agree with the minimalist approach for display.  Have you ever considered an LDR approach as an alternative for the attenuator?

Tom
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 24 May 2010, 07:55 pm
Sorry but not sure what LDR refers to exactly, but if you mean a ladder-type stepped attenuator or stepped inductor approach, it is possible, but cost-prohibitive at this level.  In order to add R/C to a stepped attenuator, you also need stepper motors, etc.  Anything can be done, it is just a matter of what people are prepared to pay for the unit.

At the MSRP = $3295, it will have to be a volume control.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: roscoeiii on 24 May 2010, 10:46 pm
Dan,

I believe that the LDR that he is referring to is the optical volume control mechanism used in the Light Speed Attenuator. Huge thread on diyaudio about it.

Title: Re: New Preamp: LS 100 and Options!
Post by: jriggy on 24 May 2010, 10:54 pm
Hey,

 My .02 is also from two places... Simplicity is great for looks BUT the digits are great on my current C/J and really handy for accuracy when comparing sources and cables re their levels...
As far as balance goes, I DO change it one click one way or the other on occasion if a recording appears slightly shifted off center to one side or the other.

~Jason
Title: Re: New Preamp: LS 100 and Options!
Post by: vlasis on 25 May 2010, 08:23 pm
Hallo my friend Dan...greedings from Greece(i want to kill all of our fucking politician)(sorry my friends).........
 Let me tell you my opinion for your new preamp....

 1- black face
(http://i496.photobucket.com/albums/rr324/liakos1/4-2.jpg)

 2- all the knobs from good shining inox (imagine the diference).
(http://i496.photobucket.com/albums/rr324/liakos1/strip_controls.jpg)

 3- no digital display(keep the analog-minimal line).

 4- give light to Mod Wright sign in the midlle(soft blue light like your amp)or make this the power button

 5-metal cones also from inox down of the base and not plastic

 Thing about it.....new lines ,new music aproach,new music touch ....from MOD WRIGHT INSTRUMENTS.......We deliver music .not just sounds  !!!!!!!

Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 26 May 2010, 12:17 am
Thanks for the explanation RE the LDR.  I will check this out!

I understand the advantages of the digital display from an accuracy standpoint.  I believe that we will reserve this for our integrated amp.  I have pretty much decided to stick with the clean analog look.  The knobs are large and I should be able to have a clear enough indicator machined in them, that is visible from a difference.  Ditto the balance control.

Vlassis, thank you for the suggestions.  We will make it available in Black or Silver.  I personally really prefer the brushed look rather than chrome.  It is just a design approach that I prefer to maintain for our entire line, but the logo WILL be backlit just like our amps!

Thanks again to all of you.

Sincerely,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: JoMoCo on 8 Jul 2010, 09:00 pm
Better late than never...I vote for the led knobs and minimalist approach....more classic and less clutter...those didgit displays seem to make a product look very dated and nitch oriented...there are others like myself who would avoid "that look" as much as possible. :roll:
Title: Re: New Preamp: LS 100 and Options!
Post by: jwes on 10 Jul 2010, 04:18 am
I like the the volume goes to eleven. You see, most blokes, you know, will be playing at ten. You're on ten here, all the way up, all the way up, all the way up, you're on ten on your pre-amp. Where can you go from there? Where? Nowhere. Exactly. What ModWright does is, if you need that extra push over the cliff, you know what Dan does? He puts it up to eleven. Eleven. Exactly. One louder.

I'm with Nigel
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 10 Jul 2010, 11:20 pm
Thanks guys, I have decided to go with no digital displays and a clean simple look.  The volume and mute control knobs are LARGE - 2" dia. and the indicator is a .25" round dimple that should be visible from across the room.

I have kept with my preferred minimalist approach.  I hope that the knobs and their indicators alone will give the visual that people want.

I understand the desire to be precise (i.e. visible digits and db readings) for comparing cables, etc.  To be honest, when I listen to music, if it isn't loud enough, I turn it up :).  If the balance is needed to adjust for any impbalance, I would expect it to be a set and forget type of thing.  For those who don't want the extra potentiometer in the signal path, we offer the ability to disable the balance control.

One of the things that we added to this model, in addition to improved sonics and aesthetics, is convenience.

From the remote you can do the following:

Volume +/-.
Mute.
Enable/disable bal. control.
Input select.
Monitor input select - bypasses all other inputs and directly selects Monitor input only.
Power on/off
Standby/Operate
Trigger (2 output triggers) remote amps or pre/pro.

The remote will be plastic for this model, given the price-point.

My philosophy is about the remote control is as follows:

We will offer a metal remote for our higher end products eventually and will offer this as an add cost option for the LS 100.  But, I couldn't see sacrificing parts quality or sonics in order to budget in the cost of a metal remote for this product.

Compared to our 9.0SE that the LS 100 replaces:

9.0SE remote controls included:
Vol. +/-
Mute.

We have added the following:

An additional main out - a total of three main outs.
Five inputs + monitor input = 6 total.
Separate Home Theater Bypass - HT/BP - operable when unit is powered off.
Standby mode.
Remote trigger outs.
Optional phono or DAC upgrade (user installable).
Balance control (defeatable).

This is a very special product and I look forward to people's feedback once we begin shipping next month.

Sincerely,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: funkmonkey on 11 Jul 2010, 07:20 am
 :thumb:  :drool: :thumb:   sounds great Dan!  I have to admit that some of the features on the LS 100 have me contemplating selling my 36.5 for this puppy, even though you say it would be a step down.  Especially things like:  Optional phono or DAC upgrade (user installable) & headphone out!  Those features (plus the others) along with the tube compliment should make this model very versatile and a very big success.  :D

-Greg
Title: Re: New Preamp: LS 100 and Options!
Post by: spike on 15 Jul 2010, 01:13 am
If an internal DAC is an option, wouldn't the user need options for multiple digital inputs? Just a thought?

Spike
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 16 Jul 2010, 04:47 am
The DAC will accept different inputs, but only one can be used at a time. I intend to provide USB as well as SP/DIF inputs.  Perhaps a simple toggle on the rear will differentiate the digital inputs.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 25 Jul 2010, 07:24 pm
Thank you, the key to this unit IS versability, function, aesthetics and, most importantly, SOUND!

We are all very excited about this piece and while it is NOT balanced, I believe that it will offer tremendous functionality and sonics at a price that is more affordable for all in this economy!

It is of course a perfect match for the identically priced KWA 100 amp!

Price = $3295 retail for KWA 100 amp; $3295 retail for LS 100 preamp.

Please see starting post of thread.  I have updated the original post and added very preliminary photos of the enclosure to give a preview of the final look of the unit.

Sincerely,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: AB on 25 Jul 2010, 08:04 pm
Looks great!

Does the MW logo glow blue like the amp?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 26 Jul 2010, 02:32 pm
Yes it does!  Input led's light too, as they are selected. As does Balance bypass.  This allows the balance feature to be useable, or bypassed.

Thanks!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: zeke on 5 Aug 2010, 03:19 am
maybe i simply overlooked it, but what is the tube complement in the LS100 ?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 5 Aug 2010, 06:26 am
Tube complement:

(2)6SN7 (or CV181)
(1) 5AR4, GZ34, 5U4G, 5U4GB, 5V4G, 5V4GB.  Basis of design is 5AR4.

I am confident that this unit will be WELL received.  I feel that it is more musical than our 9.0SE series that has long been a well appreciated design.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: mca on 6 Aug 2010, 01:08 am
Just curious, the KWA100 has balanced inputs, so how come the LS 100 is not a balanced design?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 10 Aug 2010, 06:57 am
The LS 100 is not a balanced design, because this is achieved by our LS 36.5.  Based on feedback from dealers and distributors however, we will likely make one set of the Main outs XLR, so that balanced cables can be used between the LS 100 and KWA 100.

Because of the unique input configuration of the KWA 100 (as well as KWA 150), both XLR inputs and RCA inputs are transformer input coupled (Lundahl) and thus RCA G is common to XLR -.  As such, by making XLR jacks on the LS 100, even though not fully balanced, balanced cables may be used and the effect will be the same as using RCA's.

If unclear, please don't hesitate to ask me.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: zeke on 10 Aug 2010, 07:34 am
Does it make sense to put a XLR output connection on the LS100 if it is not a true balanced output signal ?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 14 Aug 2010, 01:23 pm
OK guys, you WILL get an XLR output on the amp! :).

I am laughing as I write this, because when in HK with a unit to debut there, EVERYONE said the same thing!  It is not a balanced design, but we will make one output with XLR connectors, so that Balanced cables can be used between amp and preamp.

The KWA 100 amp has XLR inputs and RCAs and these are configured in the same way as in the KWA 150 - i.e. floated ground with RCA ground common to XLR (-).  Because of this, we can add a non-balanced XLR output to the preamp and when connected to the KWA 100, it will be seen no differently than a RCA cable.  Lastly, because both XLR and RCA inputs are transformer coupled into a differential circuit in the KWA 100, the sound should be the same via XLR or RCA.

Thanks!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 17 Aug 2010, 12:56 am
Why are the 36.5 and 9.0 called line stages and this is called a preamp?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 17 Aug 2010, 11:49 am
I am differentiating only because the LS 100 has built in balance control, headphone amp and upgrades for built-in sources such as phono or DAC.

In my opinion, a linestage has only input select, volume control and gain/buffering.

Really just a matter of semantics, quite honestly.  The LS 100 simply has more features than its predecessors.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 17 Sep 2010, 04:43 pm
Dan, do you have final pictures yet?
Title: Re: New Preamp: LS 100 and Options!
Post by: Marco Prozzo on 19 Sep 2010, 06:06 am
Dan, do you have final pictures yet?

I've got one here and will be working on photographing this weekend.  I'll post something, with Dan's permission, ASAP. Check back early next week.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 21 Sep 2010, 02:56 am
Hi Marco, please feel free to post any/all that you like.  A good front and rear shot would be most welcome and give people an idea of what it looks like.

Take care,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Marco Prozzo on 21 Sep 2010, 06:38 am
Hi Marco, please feel free to post any/all that you like.  A good front and rear shot would be most welcome and give people an idea of what it looks like.

Take care,

Dan

Here's a teaser shot to tide you over until I can work on the others...


(http://www.audiocircle.com/image.php?id=36027)
Title: Re: New Preamp: LS 100 and Options!
Post by: Marco Prozzo on 21 Sep 2010, 07:00 am
Oh, yeah....not to worry, this one goes to eleven too!


(http://www.audiocircle.com/image.php?id=36028)
Title: Re: New Preamp: LS 100 and Options!
Post by: vintagebob on 21 Sep 2010, 02:44 pm
 :drool:
Title: Re: New Preamp: LS 100 and Options!
Post by: AudioFanKJ on 21 Sep 2010, 07:21 pm
Here's a teaser shot to tide you over until I can work on the others...


(http://www.audiocircle.com/image.php?id=36027)

Is it just my eyes getting old, or does the headphone jack actually read:

HEAPHONE

 :o
Title: Re: New Preamp: LS 100 and Options!
Post by: DustyC on 21 Sep 2010, 07:36 pm
No, it does read HEAPHONE :D :D
Ask if you get a free unit!!
Oh, it isn't a contest. Damn. :D
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 21 Sep 2010, 08:57 pm
Hmmm....uhhh....errrr....it is actually a proprietary design, using our...'HEA'Phone technology....thats it! :roll:

Thanks for pointing that out guys.  I can't believe that neither myself, our machinist or any of our techs here had even caught it?!

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: AudioFanKJ on 21 Sep 2010, 10:45 pm
That must be the new proprietary "HEAPHONE" TM

This unique circuit design is ONLY found on this preamp...



Title: Re: New Preamp: LS 100 and Options!
Post by: Marco Prozzo on 22 Sep 2010, 07:22 am
Hmmm....uhhh....errrr....it is actually a proprietary design, using our...'HEA'Phone technology....thats it! :roll:

Thanks for pointing that out guys.  I can't believe that neither myself, our machinist or any of our techs here had even caught it?!

Thanks,

Dan

Hey, I'm kind of a visual guy and actually had to do work on that image file and I didn't catch it either.   :o   


(http://gregdooley.com/gallery/photos/upside_down_plane_stamp.jpg)
Title: Re: New Preamp: LS 100 and Options!
Post by: low.pfile on 22 Sep 2010, 03:56 pm
not to worry guys, your typo is minor in comparison...

http://www.popfi.com/2010/09/22/south-bends-great-pubic-schools/


(http://www.audiocircle.com/image.php?id=36065)
Title: Re: New Preamp: LS 100 and Options!
Post by: ted_b on 22 Sep 2010, 05:28 pm
Do I smell a "demo" sale on the first few LS-100's?   Collectors item.  :D
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 22 Sep 2010, 06:39 pm
If you mean the first FIFTY!?  Actually, over forty are already spoken for.  My Asian and European distributors have pre-ordered a LARGE chunk of them, U.S. dealers have grabbed a handful and a handful are going to RMAF that are already pre-sold.

Despite my inability to spell HEADPHONE ;), this is a GREAT preamp!

I would look at it more as a COLLECTABLE! :D

Thanks guys for not crucifying me too bad on this one...

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Phil A on 22 Sep 2010, 11:20 pm
Dan.  Any plans for additional dealers?  Like in the DC area?  I'll probably be looking at either a new pre/pro or something for the main system in the very near future and perhaps finalizing what I plan to do not long after CES.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 23 Sep 2010, 01:15 am
I am open to suggestions!  Good U.S. dealers are hard to come by.  D.C. area is a strong market and if you can recommend a good dealer, I will gladly get in touch with them.

Thanks,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: Phil A on 23 Sep 2010, 01:38 am
Dan - I'll send you a PM with some info
Title: Re: New Preamp: LS 100 and Options!
Post by: Marco Prozzo on 23 Sep 2010, 06:17 am
More purty pitchers....


(http://www.audiocircle.com/image.php?id=36086)

(http://www.audiocircle.com/image.php?id=36087)

(http://www.audiocircle.com/image.php?id=36089)
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 23 Sep 2010, 06:54 pm
Thanks Marco, these look great!

As you can see from the internals, we are using the 6SN7 drivers with as short a signal path as possible.  Power supply is located as far away from sensitive input signals as possible and power transformer is mounted vertically to limit stray emissions in the plane of the audio signal.

The headphone circuit can also be seen, in the lower right front quadrant of the preamp.  It is a purely discrete, MOSFET based follower circuit, biased in Class A to provide what I believe to be a very high quality integrated headphone amp.  This is opposed to the typical op-amp based afterthought offered by many mfrs.

All controls are via pushbutton and the control circuit is much more complex, allowing for much greater function via the 10-key remote!

Remote and balance controls are also located as close to input signals as possible, to keep noise levels down.

The two 20-pin headers and open outlined space on the board is where the optional phono or DAC board is installed.  Phono design is being finalized right now and DAC upgrade to follow later this year.

The taller chassis allows for greater range of rectifier choices, including 5U4GB, 5V4GB, 5U4G and 5V4G, but check height of some 5U4G/5V4G type tubes as many are very tall, such as the EML 5U4 and will not fit.  Inside chassis dimensions are 5".  I will determine max tube dim. and post here also.  This max dim. can be found on any tube datasheet, so you can tell which rectifiers will fit and be useable.

The 6SN7 tubes are being operated at VERY conservative operating pionts, so that tube life will be very long.  The use of our proprietary 'mu' variant circuit and top quality components result in what we feel to be a perfectly balanced sound, providing the strength of SS circuits with the beauty of tubes.

Thanks,

Dan W.



Title: Re: New Preamp: LS 100 and Options!
Post by: Toon on 24 Sep 2010, 10:36 pm
Dan,
I notice you haven't labelled the inputs for Left & Right Channel! While I doubt any prospective owner really needs the help, it's still kinda traditional   :)
Title: Re: New Preamp: LS 100 and Options!
Post by: Marco Prozzo on 25 Sep 2010, 04:35 am
Dan,
I notice you haven't labelled the inputs for Left & Right Channel! While I doubt any prospective owner really needs the help, it's still kinda traditional   :)

You can't really see it in the pic, but the RCA jacks have the standard color-coded base-rings (red on bottom and black on top). 
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 3 Oct 2010, 03:01 am
Hi guys, not only is the LS 100 shipping, but we have nearly sold out the first production run of 50 units?!  I have just finished the first LS 100 Phono upgrade and am listening to it right now.  It is quieter and as good or better sounding than our previous $5K SWLP 9.0SE with external supply.  The LS 100 with internal phono and internal PS is just over $4K.

I am very excited about this new preamp!  It has truly achieved what I hoped that it would, in picking up where the 9.SE 'Sig. Ed.' left off, at 10% increase in price and MUCH greater % improvement in aesthetics, sound, functions and upgradeability.

You have all seen the pictures, so you know the aesthetic differences.

Following are the functional upgrades that the 9.0SE didn't have:

1) Built in Class A headphone amp.
2) Remote control: power, balance control select, remote triggers (2), input select.  It also has volume control and mute, as the 9.0SE did.
3) XLR inputs (one pair) and XLR outs (one pair) - not truly balanced.
4) Two remote triggers.
5) Balance control - may be bypassed.
6) push-button interface instead of toggles.
7) Optional user-installable DAC or phono upgrade.
8) 6SN7 driver tube instead of 5687 drivers.

Design and layout have been optimized for improved grounding and noise suppression from power supplies and new larger and non-resonant enclosure.  Taller rectifiers may be used, such as 5U4GB and 5V4GB's.

Thanks!

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: vintagebob on 3 Oct 2010, 05:08 am
I look forward to listening to it!

It seems like you are happy with the new phono board?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 8 Oct 2010, 01:42 am
I am VERY PLEASED with the first phono board, yes! I am building the second of two proto boards and am about to order the final production PCB's.

I was pleased enough with the first unit, to send it to RMAF for use at the show!  We are using a VPI Classic with Dnyna 20x cart I believe it is.  The folks at VPI were gracious enough to loan me one of their FANTASTIC 'Classic' TT's.  This unit is really beautiful and sounds beautiful too.

Yes, my $15K ($21K with triplanar arm and Shelter 901 cart) Redpoint Model A sounds better, but the price difference is HUGE and I could be QUITE happy with the VPI.  I chose to bring the VPI in order to display a system that reflects realistic system price-pionts and to show the high-value of our gear and what can be achieved within a 'reasonable' budget!

Thanks,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 8 Oct 2010, 12:21 pm
Dan, the headphone amp is Class A meaning it is solid state and not driven by the tube stage?
Title: Re: New Preamp: LS 100 and Options!
Post by: hrcapers on 8 Oct 2010, 03:57 pm
Looks like there are (2) 12AX7 type tubes in the phono board. From Dan's previous quote:

"I am listening to our LS 100 right now with Sovtek rectifier, new production 6SN7 Tung-Sols (by Sovtek), but I DO have a pair of special tubes in the LS 100 Phono upgrade module that I am voicing.  I found a Tung-Sol 12AU7 and Brimar 12AX7 in my stash and vinyl is sounding AMAZING!"

Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 8 Oct 2010, 04:08 pm
I was referring to the headphone amp.  Isn't that different?
Title: Re: New Preamp: LS 100 and Options!
Post by: hrcapers on 8 Oct 2010, 04:36 pm
Sorry, I should read more carefully. If I remember correctly, in my modded XA-777ES, Dan took a feed off the tube output to power the headphone jack. I'd be surprised if the headphone circuit is NOT powered by the 6SN7s. Dan?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 8 Oct 2010, 09:17 pm
This is actually how it works:

The signal to the headphone circuit IS fed via the tube circuit.  The output impedance of the LS 100 tube circuit is 300 ohms.  Headphones range from 32-600 ohms generally speaking, with Grados being 32 ohm, Senn's being 600 ohm and others somewhere in between I imagine.

The rule of thumb between low-level (preamp) and high-level (amp) impedance ratio is about 100 x.  Thus, our preamp would be ideally suited with amps having a min. input impedance of 3K.

in the case of speakers and amps, there is also a need for a ratio (called damping factor) between output impedance of amplifier and impedance load of speakers.  Most SS amps have Zout of MUCH less than an ohm, hence product damping factors of 100-1000+ for SS amps.  In the case of tube amps, it is typically much lower and this too attributes to the different control that SS amps have over speakers vs. tube amps.

The headphone is just a speaker, albeit requiring MUCH less power.  Our headphone amp produces 1.5W at clipping into a 32 ohm load.

The purpose of the headphone amp itself, is to take the signal from the preamp tube output stage and buffer (amplify current) and provide impedance matching.  In our case, we use a discrete FET stage to buffer current and provide the VERY LOW Zout (on par with SS amps) in order to drive headphone loads properly.

The other way that this is accomplished with tube preamps and headphone amps is with output transformers, that allow for impedance matching.  I did not experiment with high-quality output transformers for the headphone circuit in our LS 100 because they would have added significant cost to the overall product.

Most mfrs. that add a headphone output, simply add an op-amp to the output of the circuit, which also buffers current and matches impedance, but does so with an inherently feedback-based device.  In our case, the circuit is discrete, pure Class A and uses zero feedback.

I believe that this provides a high-quality headphone out as an added feature without significantly raising the product price.

We power the FETs in the headphone amp from the 12V windings of the transformer that power the heaters in the tube circuit.  Obviously the headphone amp voltage is separately regulated.

I hope this clears things up.

Thanks,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: hrcapers on 22 Oct 2010, 07:55 pm
Just received my RMAF demo today. Looks like I have won the very collectible "HEAPHONE" model lottery. 8)
As far as the sound, all I can say is WOW!!!!!!!!
This replaces a very recognizable and expensive balanced preamp in my system and the difference is very noticeable. Modwright has another winner here. Thanks Dan. Incredible...
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 23 Oct 2010, 12:19 am
You must be further west than I am (east coast) since mine won't get here until Monday. :cry:
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 26 Oct 2010, 09:03 am
Thanks hrcapers!  I appreciate the positive feedback.  The LS 100 is a product that we are all very pleased with at MWI.

Take care and enjoy!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 4 Nov 2010, 06:04 pm
More purty pitchers....

(http://www.audiocircle.com/image.php?id=36087)


Are those balanced inputs and output on LS-100 or just XLR connectors?
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 4 Nov 2010, 06:08 pm

Compared to our 9.0SE that the LS 100 replaces:

We have added the following:

<snip>

Separate Home Theater Bypass - HT/BP - operable when unit is powered off.

<snip>

This is a very special product and I look forward to people's feedback once we begin shipping next month.

Sincerely,

Dan

I am not home now but for some reason I thought I read in the owner's manual that the unit has to be on for HT bypass.

For anyone who has not had the opportunity to play with this toy, it is a sight to be seen and an equally wonderful sounding unit.  and I haven't even had the chance to roll in different tubes yet.
Title: Re: New Preamp: LS 100 and Options!
Post by: ted_b on 4 Nov 2010, 06:21 pm
No, the XLR's are available so as to use balanced cabling.

The LS 100 is not a balanced design, because this is achieved by our LS 36.5.  Based on feedback from dealers and distributors however, we will likely make one set of the Main outs XLR, so that balanced cables can be used between the LS 100 and KWA 100.

Because of the unique input configuration of the KWA 100 (as well as KWA 150), both XLR inputs and RCA inputs are transformer input coupled (Lundahl) and thus RCA G is common to XLR -.  As such, by making XLR jacks on the LS 100, even though not fully balanced, balanced cables may be used and the effect will be the same as using RCA's.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 4 Nov 2010, 06:49 pm
To allow you to use cabling you may already have?  There aren't any sonics differences, right?
Title: Re: New Preamp: LS 100 and Options!
Post by: hrcapers on 4 Nov 2010, 07:13 pm
I'm running balanced cables from the LS 100 to the KWA 150. The only differences that I hear are all for the better :D
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 5 Nov 2010, 03:09 am
The XLR connectors found on the LS 100 are there for convenience.  The unit is still single-ended and they allow the use of balanced cables if you prefer to use them.

Because of the unique way that the inputs of the KWA 100/ 100SE and KWA 150 are designed, with RCA ground common to XLR (-) and transformer input coupled, it will function the same, whether using RCA or XLR cables.

The intent of this design was to take AS MANY of the comments and requests from the SWL 9.0SE as possible and include them in the LS 100:

1) Balance control (defeatable)
2) XLR input and outputs - even if wired SE.
3) Internal phono or DAC option.
4) Headphone Amp - Class A, discrete (no op-amps).
5) Home Theater Bypass (also on 9.0SE and LS 36.5)
6) Power, input select and 12V remote triggers on remote control.

We also improved the sonic design, switched to the 6SN7 tube and made it a more attractive piece.

To answer the other question about HT/BP, it DOES require the unit to be on in order for this function to operate.

Thanks!

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 7 Nov 2010, 08:44 pm
When a preamp like the LS-100 has 2 6SN7 driver tubes does that mean that one is driving one channel and the other is driving the other channel?  I really don't understand tube designs so I could be way off.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 14 Nov 2010, 12:11 am
In this case the two tubes are used one per channel.  We chose to use one triode per channel and the other is unused.  This gives the advantage of extended tube life as you can swap the tubes one channel for the other and then use the other triode per channel.

We theoretically could have used a single 6SN7, one triode per channel.  In the case of our phono board, we do use a single 12AU7 and a single 12AX7 for two gain stages, again, using one triode per channel, per tube.

Thanks,

Dan
Title: Phono AND DAC?
Post by: denjo on 14 Nov 2010, 10:03 am
Hi Dan

Would there be space in the chassis for BOTH a phono and DAC?
I was recently at your Singapore agent, AudioTrio's, showroom and was mighty impressed with the KWA 100 and LS100 Linestage! They had just arrived that morning and already the sound was something quite special!

Best Regards
Dennis
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 16 Nov 2010, 07:09 am
I'm sorry but there is only room inside for one upgrade option.  We will likely at some point, offer standalone DAC and phono, possibly based on our internal designs.

Thank you for your words of support.

Sincerely,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 11 Dec 2010, 04:20 pm
I recently acquired a pair of Audez'e LCD-2 headphones and have been listening to them with the LS-100.  This combination sounds truly amazing and the LCD-2s aren't fully broken in (at least the cable isn't).  I also listened to the LCD-2s with a $600 headphone amp and there was no comparison to the LS-100.  As described by Dan earlier in this thread, the LS-100 is also a wonderful headphone amp.
Title: Re: New Preamp: LS 100 and Options!
Post by: Ern Dog on 13 Dec 2010, 04:21 am
What are the sonic differences of the LS 100 vs 9.0SE ?
Title: Re: New Preamp: LS 100 and Options!
Post by: vintagebob on 13 Dec 2010, 10:09 pm
I had a group of AC folks over on Saturday for a little DAC comparison.  Most of these guys were familiar with my previous system and they were very impressed with the sound quality that the LS100 provided.

For me, compared to my previous preamp, the LS100 provides improvements in sound staging, especially instrument placement.  I also like the smooth vocals and overall clarity of the presentation.

If you are looking for a new preamp I would at least hop on the demo tour and listen to the LS100. 

Kudos to the Modwright team!
Title: Re: New Preamp: LS 100 and Options!
Post by: Charles Xavier on 13 Dec 2010, 10:19 pm
I had a group of AC folks over on Saturday for a little DAC comparison.  Most of these guys were familiar with my previous system and they were very impressed with the sound quality that the LS100 provided.

For me, compared to my previous preamp, the LS100 provides improvements in sound staging, especially instrument placement.  I also like the smooth vocals and overall clarity of the presentation.

If you are looking for a new preamp I would at least hop on the demo tour and listen to the LS100. 

Kudos to the Modwright team!

Did or when does the tour start ?
Title: Re: New Preamp: LS 100 and Options!
Post by: Audioclyde on 14 Dec 2010, 03:46 pm
Do the Black Treasure cv-181z's (ie, 6sn7) work in the LS 100, physically and electronically?
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 14 Dec 2010, 04:00 pm
I haven't tried it but it should fit and will work electronically.
Title: Re: New Preamp: LS 100 and Options!
Post by: Audioclyde on 14 Dec 2010, 04:02 pm
Great; I know that Dan had confirmed it was safe to use in the MW Transporter.

I have NOS TSRP's, as well as some Ken-Rad's, that I will try, but I was really impressed with the Black Treasures in my MW Transporter.

Thanks,

Randy
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 14 Dec 2010, 04:08 pm
I am using TS BGRPs in the LS-100 and Treasures in the MWTP.  I just rolled Sylvania Bad Boys in the MWTP to see how that sounded.  Too early to report anything.
Title: Re: New Preamp: LS 100 and Options!
Post by: jriggy on 15 Dec 2010, 02:22 pm
Quote
I am using TS BGRPs in the LS-100 and Treasures in the MWTP./quote]

BGRP's? Does that mean the Round Plates? Wondering what the "BG" means.
I have TS RP's, I take it you are enjoying then in the LS 100?
Title: Re: New Preamp: LS 100 and Options!
Post by: funkmonkey on 15 Dec 2010, 06:18 pm
I am using TS BGRPs in the LS-100 and Treasures in the MWTP.
BGRP's? Does that mean the Round Plates? Wondering what the "BG" means.
I have TS RP's, I take it you are enjoying then in the LS 100?

BG = Black Glass ...if I am not mistaken
RP should indeed be Round Plate

Tung Sol Black Glass Round Plates is a just little bit more typing than TS-BGRP
Title: Re: New Preamp: LS 100 and Options!
Post by: jriggy on 15 Dec 2010, 08:36 pm
Oh! Of course, black glass...  I have em. Thought so but was spacin the BG. Thanks Funk

Title: Re: New Preamp: LS 100 and Options!
Post by: kenreau on 15 Dec 2010, 10:24 pm
Hey Dan, 

Just a post to say the new preamp is beautiful and sounds great.  I was at Echo Audio in Portland yesterday and they had it on display playing in the listening room.  It sure looks great with the cool blue back lighting and new chassis architectural metal work.  Very nice :thumb:

Kenreau
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 15 Dec 2010, 10:25 pm
Thanks Ken!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: vlasis on 15 Dec 2010, 10:39 pm
http://www.avsite.gr/vb/showthread.php?t=92520
Title: Re: New Preamp: LS 100 and Options!
Post by: Phil A on 17 Dec 2010, 04:38 am
Nice pictures!
Title: Re: New Preamp: LS 100 and Options!
Post by: vlasis on 17 Dec 2010, 06:51 am
  Ī¤hanks Phill......its an Audio Video forum from Greece and i have my own category(i  am coordinator) with Hi end products.....many friends know the Mod Wright products from me and this site.....

I am a (DAN)believer!!!!!!!! :green: :P
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 19 Dec 2010, 09:15 pm
Thank you so much Vlasis!  You are a true gentleman!  I appreciate your support and that you took the time to put together so much information on the Greek forum.

For the record!  Vlasis is NOT on the MWI payroll.  He is just a happy customer and a very gracious person.

Take care!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Srajan Ebaen on 21 Dec 2010, 04:44 pm

(http://www.6moons.com/audioreviews/modwright7/open1.jpg)
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 21 Dec 2010, 06:31 pm
Preview is up at 6Moons:

http://www.6moons.com/audioreviews/modwright7/1.html (http://www.6moons.com/audioreviews/modwright7/1.html)

Lots of good factual information about the product and great photos and background also.

Thank you for your thoroughness Srajan!

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: bummrush on 21 Dec 2010, 07:43 pm
That is one he'll of a good pic above
Title: Re: New Preamp: LS 100 and Options!
Post by: hrcapers on 28 Dec 2010, 12:29 am
Just a quick note on the LS 100 phono stage. I installed the phono stage last week. Had a pin misalignment on the first try (old eyes), but no harm. Reinstalled it correctly the second time. This is a "must have" for those of you with both vinyl and an LS 100. Comparing it to the tubed Oppo, they are much more alike than different. The differences are only the standard analog vs. digital differences. The phono stage bests the tubed Oppo in width of soundstage and treble purity. The Oppo besting the phono stage in bass and clarity. My phono playback uses a Rega 25 and Grado Sonata cartridge, no special cabling, so I'm fairly certain that a better vinyl system will remove the slight veil that's only apparent when switching to the Oppo for comparison.

The really great part is that the sale of my old phono stage, it's pair of interconnects, and it's power cord MORE than paid for the phono stage.

It's a tribute to Dan that my old $60K system is now a $30K system, and sounds so much better!!!
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 28 Dec 2010, 12:51 am
What tubes are you using with the phono stage?
Title: Re: New Preamp: LS 100 and Options!
Post by: hrcapers on 28 Dec 2010, 01:11 am
Dan selected a couple from his collection. Not sure what they are. I'm using his 12AU7, but I put a NOS Mullard CV4004 in the other spot. Didn't really take the time to compare since I needed to get things put away for the Christmas family dinner.
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 28 Dec 2010, 01:48 am
Interesting since I just bought the Mullard CV4004 for this.  I am going to be using a Tung-sol black plate 12au7 with the Mullard.
Title: Re: New Preamp: LS 100 and Options!
Post by: celticsfan1 on 30 Dec 2010, 12:33 pm
Can I put the LS100 into standby mode with the KWA150 powered up? Does it turn off the tubes?

Is it recommended to leave the KWA150 powered up 24 hours a day?
Title: Re: New Preamp: LS 100 and Options!
Post by: K Shep on 30 Dec 2010, 02:19 pm
I had a group of AC folks over on Saturday for a little DAC comparison.  Most of these guys were familiar with my previous system and they were very impressed with the sound quality that the LS100 provided.

For me, compared to my previous preamp, the LS100 provides improvements in sound staging, especially instrument placement.  I also like the smooth vocals and overall clarity of the presentation.

If you are looking for a new preamp I would at least hop on the demo tour and listen to the LS100. 

Kudos to the Modwright team!

I'm one of the AC folks that visited Bob's.  I love the LS100 and the difference in sound it has made to his system are positive! 

Team ModWright, please give attention to Bob and the issues he has with the HT bypass and phono stage features of his preamp.   
Title: Re: New Preamp: LS 100 and Options!
Post by: ted_b on 30 Dec 2010, 02:42 pm
Celticfan1,
No need to leave the KWA on 24/7.  I find that a few hours is PLENTY for any true settling in, and really no more than about an hour.  I only run mine (black anodized monoblocks) 24/7 when breaking equipment in.  The room heat is a nice plus at this time of year.  :)
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 4 Jan 2011, 03:24 am
I have already sent Bob a replacement phono stage as he LITERALLY had the very first and there was some improvements made.  I have also offered to have him send his entire preamp back - very early production as I learned of a potential grounding issue and also an oversight on the VERY first PCBs that effect the HT/BP operation.  He has agreed to send it to me.

Aside from these bugs that I found in the first couple of units, they are flying off the shelf and everyone is VERY pleased with the design!

I always take care of our customers and Bob is no exception.

Sincerely,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: ted_b on 4 Jan 2011, 03:33 am

I always take care of our customers and Bob is no exception.

Sincerely,

Dan W.

+1
Title: Re: New Preamp: LS 100 and Options!
Post by: vintagebob on 4 Jan 2011, 03:56 am
Thanks K Shep.  Dan has been taking care of me.   :green:
Title: Re: New Preamp: LS 100 and Options!
Post by: bobup1998 on 20 Jan 2011, 02:41 am
Has anyone out there tried the Shuguang CV181 Black Treasure tubes in the 6SN7 slots of the LS100?  And are they in fact safe to use in the LS100?
I most certainly do not wish to take any chances with my new unit, so any expert advice would be greatly appreciated!
Any other tube-rolling experiences for good or ill would be appreciated as well...
Title: Re: New Preamp: LS 100 and Options!
Post by: jriggy on 24 Jan 2011, 07:06 pm
^ I think they are OK, as I seem to recal someone here trying them out in the LS 100 but cant find the post. I may be mistaken.

 You should contacted Dan directly to check... Then let us know!  8)
Title: Re: New Preamp: LS 100 and Options!
Post by: bobup1998 on 24 Jan 2011, 11:17 pm
Dan emailed me to let me know the Shuguang Treasure tubes are OK for the LS100:  "Our design does NOT ask much of the tube - i.e. NOT high plate voltages or current, so ANY 6SN7 or equivalent will work and you will NOT damage the preamp or tubes."
If anyone tries them please let us know what you think!



Title: Re: New Preamp: LS 100 and Options!
Post by: mraudio on 26 Jan 2011, 11:13 pm
I also spoke with Dan and he did indeed say the Black Treasures would work.  He also recommended the Sophie Electric 6SN7 tubes.  I have ordered BOTH sets and will post my impressions once I get them and get a few hours on them.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 3 Feb 2011, 09:47 pm
Plesae do share your experiences.  I have been meaning to order a pair of the Sohpia 6SN7 'A' grade, but have simply not had a chance to yet.  I will share my impressions once I do.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: bobup1998 on 6 Feb 2011, 12:33 pm
Hi All,

I have received a pair of Shuguang Black Treasures and put them in the LS100.  Below is the email I just sent to both Dan and Grant Fidelity...

I received the Shuguang CV181-Z (6SN7) Treasures and a NOS 5AR4 and burned them in for a few hours yesterday.  Even though the LS100 and the tubes have only a few hours on them, I was quite unprepared for the sounds I heard during my first listening session.  For the first time in my audio life my speakers literally disappeared, and the imaging filling my room was almost palpable...very 3-D indeed, to the point of being almost scary-real.  I sat in wonderment; left wanting for nothing with the music being produced with such crystal clarity and startling precision from top to bottom.  I can only anticipate what further improvements may happen as both the preamp and tubes continue to settle in together.
To be brief, my searching for the next best preamp is over, as is my searching for the next best tubes to put in that preamp.  This combination has taken my humble audio system from good to "wow"!
Thank you Dan for designing such a wonderful preamp at such a fair price, and thanks also to Shuguang for producing a pair of tubes that have taken that preamp way over the top in audio quality.  Job well done!

Wayne R
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 6 Feb 2011, 11:39 pm
Wayne, what tubes were you using before?
Title: Re: New Preamp: LS 100 and Options!
Post by: bobup1998 on 8 Feb 2011, 12:21 pm
I had been using the factory supplied TungSol 6SN7's (new production, not NOS) with the Sovtech 5AR4.  I also briefly tried vintage TungSol round plates...good, but not as clear and extended as the Treasures in my system.  I have not heard the Sohpia 6SN7s, but as I mentioned to Dan they would have to be extraordinary to replace the Shuguangs Treasures in my system.  For me it's the old "you'll know it when you hear it" phrase that perhaps applies best, and in my system I do indeed.  Big fun!
Title: Re: New Preamp: LS 100 and Options!
Post by: padre_power on 17 Feb 2011, 10:00 am
Hi Everyone from the Land Down Under,

I am new to this forum and am now the happy owner of both the LS100 and KWA100SE

I have fitted Shuguang CV181-Z Treasures,  A+ grade from Grant Fidelity, and also a Mullard GZ34 NOS 5AR4. Also fitted Herbie's Tube Dampers and Herbie's Iso Cups with Lampblack Balls.  Everything has made a worthwhile improvement even in these early stages.
I am really impressed and discovering the most liquid and best vocals I have ever had.
For those of you interested I have an Accuphase DP500 CDPlayer and Avalon Ascendent Loudspeakers.
Cabling is all the latest Grover Huffman. (These are excellent and another steal in audio)

I am looking forward to more impressions on the LS100 and will be keen to hear what others are using for valves etc.


Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 20 Feb 2011, 11:07 pm
Thanks for the feedback!  We are very happy with the LS 100 and our KWA 100/100SE and 150.

We are now shipping the new 150 'Signature Edition' amps too!

Take care,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Audioclyde on 21 Feb 2011, 12:14 am
I have not yet tried the Black Treasures (and I'm a big fan of those tubes), but I've rolled quite a few other very nice tubes in my LS 100.  My favorites so far are Brimar, clear glass, black base with orange lettering.  For me these have bested NOS TS round plates, RCA red base 5962's, Sylvania VT-231 bad boys, RCA clear & smoked glass, Pope and KenRad VT-231's.

The Brimars, along with Pope or Sylvania's in the driver position of my 845 amp, seem to be magic.

I'm also using a Mullard fat base gz34 as the rectifier.

Randy
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 21 Feb 2011, 01:25 am
Are the Brimars CV 1988s?  I have been using TS BGRPs in my Ls-100 along with the same rectifier and I haven't rolled it out yet.
Title: Re: New Preamp: LS 100 and Options!
Post by: jriggy on 21 Feb 2011, 02:10 am
Grabbed a pair of Black Treasures from a fellow ACer. They were in the LS 100 for a few hours and were unbelievably good! I was most surprised with the incredibly 3D depth they added. Unfortunately I had to remove them due to noise and drop them in my tubed Oppo. Not the best spot for them in my system but their noise is not noticeable in the Oppo for some reason...

 Could the LS 100 be more sensitive to microphonics than tubes in source units might be?

Also, are you guys replacing the cover every time while tube rolling? Wondering if it is ok to leave the cover off for a stretch, if checking out a few tubes in an evening? Keeping in mind all safety precautions of course, unplugging it and not touching anything while it is plugged in...
Title: Re: New Preamp: LS 100 and Options!
Post by: dminches on 21 Feb 2011, 02:19 am
It is fine to leave the cover off assuming no one goes near the unit while it is on.  Dan confirmed this.

Can you describe the noise you were experiencing?
Title: Re: New Preamp: LS 100 and Options!
Post by: Audioclyde on 21 Feb 2011, 02:23 am
Are the Brimars CV 1988s?  I have been using TS BGRPs in my Ls-100 along with the same rectifier and I haven't rolled it out yet.

No, just labeled 6SN7, with etched codes like "1J5"...I previously had some Brimar CV1988's (when I ran the MW Transporter); from memory I'm liking the sound of these Brimars quite a bit better than the CV1988's--of course they are in a different circuit.

Randy
Title: Re: New Preamp: LS 100 and Options!
Post by: jriggy on 21 Feb 2011, 02:37 am
It is fine to leave the cover off assuming no one goes near the unit while it is on.  Dan confirmed this.

Can you describe the noise you were experiencing?

First it was static. Then after reinstalling them it was much better but still a touch of a crackling sound and at one point a microphonic 'whistling' of sorts. Also, when taping on the front faceplate of the LS 100 the 'bonk' sound would come through the speakers too. that means microphonic tubes right?
Still doing some testing to make sure where it is, on all tubes, but Im pretty sure I was just sold some microphonic BT's... Sad really.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 21 Feb 2011, 03:41 am
Sounds like bad AND microphonic tubes unfortunately.  Sorry to hear it.

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: nnck on 23 Apr 2011, 05:27 pm
I know there was rumor of a newer and better remote for use with the LS100. Not sure how much discussion there has been, or if the design is too far along to offer suggestions.

But the one function I'd really like over the standard remote is the ability to enter a source input directly rather than scrolling thru all the inputs to get to the one you want. Overall, I know it's a minor thing. But helps with people like me who often overshoot the source they want and always have to 're-scroll' to get to the desired input.
Title: Re: New Preamp: LS 100 and Options!
Post by: LAURENT on 30 Apr 2011, 07:43 pm
hi...... I have a preamp  Modwright LS 100 and i like to buy a DAC ..... I know i can upgrade a DAC in the LS 100, but when it's available and how much for this upgrade....please
 ..... thank you for your reply
Laurent
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 11 May 2011, 02:40 pm
Hi guys, the DAC is still a work in progress.

We are having a metal remote made, but the functions will be the same.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Audioclyde on 24 Jun 2011, 05:45 pm
Dan, any update/news on the DAC board for the LS100?

Thanks,

Randy
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 25 Jun 2011, 05:50 pm
Ugh!  I am frustrated as we are still working through the last details of the DAC design itself and I am still also working out which OEM to use for the USB input.  It must be 24/192 USB and I want to be sure that it has drivers for both MAC and PC.

Don't give up on me, it WILL be available and it WILL be exceptional!

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: padre_power on 11 Jul 2011, 07:18 am
DAN

Just two questions regarding the LS100.

When will the DAC be completed and for sale?

When will the more upmarket Remote be available?

As a happy owner these two things are all I am craving for.

Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 15 Jul 2011, 03:26 am
I am shooting to have the DAC design complete by Oct.

The new remotes will be available in late August.  They are in production right now.

Thank you,

Dan W.
Title: Re: New Preamp: LS 100 and Options!
Post by: AB on 15 Jul 2011, 03:56 am
What's the likelihood of a standalone DAC by RMAF?

Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 20 Jul 2011, 02:32 pm
It is my hope to do so!  The engineering is done!  It is a matter of PCB production and assembly.  I am scrambling right now, to get ready for the HK show and am taking a 'first article' of the new KWI 200 Integrated with me. 

I am going to send the PCB order off to the board house for the DAC today.  Chances are VERY good that the DAC will be at RMAF.  The Integrated WILL for sure.  Once DAC digital core module design is done, it will be available as upgrade option for LS 100 and KWI 200 and of course rolled out as a standalone tube DAC also.

Thanks!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: AB on 20 Jul 2011, 03:05 pm
It is my hope to do so!  The engineering is done!  It is a matter of PCB production and assembly.  I am scrambling right now, to get ready for the HK show and am taking a 'first article' of the new KWI 200 Integrated with me. 

I am going to send the PCB order off to the board house for the DAC today.  Chances are VERY good that the DAC will be at RMAF.  The Integrated WILL for sure.  Once DAC digital core module design is done, it will be available as upgrade option for LS 100 and KWI 200 and of course rolled out as a standalone tube DAC also.

Thanks!

Dan

Ok. I'll take one. See you in October. :thumb:
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 20 Jul 2011, 10:33 pm
Sounds good AB.  Look forward to seeing you and your wife there as always.

Take care and be well!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: LAURENT on 10 Nov 2011, 08:23 pm
Hi...for my information please.....how long in hours duration for the 3 tubes of the LS 100 Preamp....
 how many hours in normal use .... thank you all
Laurent.....
nothing....i received no response ...no help....thanks you all....
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 17 Nov 2011, 04:43 am
The LS 100 is a great product.  It has a slightly warmer overall tonality compared to the 36.5.  Overall the 36.5 is a bit quieter.  The LS 100 is a newer product and is more feature-rich and the DAC upgrade is nearly done and the phono upgrade is already available.  The LS 36.5 offers truly alanced outputs and uses the 6H30 tube, while the LS 100 uses the 6SN7.

I am also working on both a standalone tube DAC and tube phono stage, with external power supply.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: mca on 17 Nov 2011, 05:21 am
When do you expect the DAC upgrade to be done? Any idea of the cost?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 25 Nov 2011, 09:49 pm
Hi, still have not finalized price for the DAC upgrade, but expect it will be in the $1K range.

I am expecting the DAC boards next week and can start proto-typing the entire project at that time.  We have the design of the digital input receiver/clock/microprocessor complete and boards in hand, with assembly to be completed over the next two weeks.  I have two complete input boards on hand for prototyping while we wait for the rest to be assembled.

I can tell you all the following about the upgrade:

DAC: Burr Brown PCM1794, current output type, from same family as used in the Sony XA-5400ES, but of higher grade.  24-bit and fully capable of 24/192 input.

Formats available:  For KWI 200 and LS 100 upgrades = RCA and USB (24/192 'asynch').
Standalone DAC: RCA, AES/EBU(XLR), USB and optical.

DAC upgrades for LS 100 and KWI 200 will include the digital input receiver board and DAC daughter board, as well as the USB board.  The internal power supplies and analog stages of the integrated and preamp will complete the design.

The standalone design will be tube-based (one option at least), with an even MORE sophisticated all-tube power supply that I am working on right now.  I intend for the DAC to be two separate boxes, approximately the same size as our outboard PS 9.0 power supply = 8"Wx10"Dx4"H.  They will thus both fit on a single shelf or on separate shelves, over/under.  The power supply however, will be completely separate from the DAC and analog stage.

I may also design a simpler one-box design at a lower cost, perhaps with SS analog stage.

I plan to have AT LEAST the DAC upgrades in use at CES, for the KWI 200 and LS 100.  I would LIKE to have a prototype of the external DAC, but we will see.

I have several projects underway right now and am in heavy design mode, as my team works overtime, building the KWI 200's and our other mf'd. products and my lead mod tech continues to have a backlog of mods scheduled.

Thanks!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Syrah on 25 Nov 2011, 10:39 pm
Really looking forward to all of this Dan.  How much do you think the standalone DAC and phono stage will cost?  It would be pretty smart if they could share a power supply (to keep costs down) since one is necessarily using one or the other.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 9 Dec 2011, 12:27 am
Target price for Phono is $3K.  DAC will be more, but am working out the final numbers.

Supply will be the same, so one could use same supply for either DAC or Phono, but not at the same time!

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: NickG on 18 Dec 2011, 03:27 pm
Can someone please tell me how many decibels the volume increases with each 'click' of the remote volume button? 

Thank you
Title: Re: New Preamp: LS 100 and Options!
Post by: raddar on 24 Dec 2011, 01:06 am
Can someone please tell me how many decibels the volume increases with each 'click' of the remote volume button? 

Thank you
Nick,

There are no "clicks" on the remote. If you touch the volume "+" for 0.5 seconds, it will increase less than if you hold the button down longer. The remote volume buttons are continuous as long as your finger is on the button, it will increase or decrease the volume.
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 29 Jan 2012, 09:52 pm
It is not a stepped attenuator and I have honestly not measured the normal dB increase for a single button-push, i.e. one pulse to the input receiver.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: Jflemelin on 31 Jan 2012, 02:15 am
Hi Dan,

In your last post about 1st shipment date for the DAC upgrade january 2012 was stated as tentative date. Are they shipping yet?

Also, on which chip is the DAc based on? And finally, ideally a DAC would have it's own power supply (I think...), do you expect the DAC to change the sonics of the LS100 in any way?

Thanks for your involvement with your customers! It's much appreciated!

Jean-Francois
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 1 Feb 2012, 09:56 pm
Hi, I did say that it would be shipping in the LS 100 in January, and while we were able to prepare a prototype for CES, I still have a bit more testing to do before I can release it.

The DAC DOES actually get its own power supply, completely separate from the LS.  I had hoped to be able to use the 12V supply in the LS. But that was not a good solution.  So, we install a PS with its own transformer and filtering and then a final regulation stage right at the DAC/Input receiver.

I will post here with more progress as we go.  It really won't be long now!

We also showed the KWI 200 SS integrated at CES with both phono AND DAC options installed ($6500 - with all options) and it was very received.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: danvu on 23 Mar 2012, 06:17 am
Hi there,
Any news on the DAC for LS 100? Specs, price, pictures? I have heard about this but haven't seen it/read reviews on it yet.
Thanks,
Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 30 Mar 2012, 05:03 pm
Hi, it is 99% complete and I HAVE worked out the issues that I had with USB input.  I have a few standing orders to complete first and then it will be in full production.

The upgrade cost is $1150 retail.

It has RCA (SPDIF) and USB (24/192 fully asynchronous) inputs and features a digital input receiver that both buffers data and reclocks all incoming signals.  The DAC is the PCM 1794.  The entire digital circuit is powered via a separate and dedicated power supply.

It uses the tube stage in the player as the analog stage.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: nnck on 30 Mar 2012, 05:19 pm
Dan-

Am I right in still assuming that the DAC input is NOT am option for those of us using the optional phono stage? I mean, there is no way of easily converting one of the other inputs to accept the new DAC?

I'm not willing to give up my phono stage, but it would be nice to try the DAC too.
Title: Re: New Preamp: LS 100 and Options!
Post by: SoCalWJS on 30 Mar 2012, 05:32 pm
Hi, it is 99% complete and I HAVE worked out the issues that I had with USB input.  I have a few standing orders to complete first and then it will be in full production.

The upgrade cost is $1150 retail.

It has RCA (SPDIF) and USB (24/192 fully asynchronous) inputs and features a digital input receiver that both buffers data and reclocks all incoming signals.  The DAC is the PCM 1794.  The entire digital circuit is powered via a separate and dedicated power supply.

It uses the tube stage in the player as the analog stage.

Thanks,

Dan


Slightly confused - Player?
Title: Re: New Preamp: LS 100 and Options!
Post by: wilsynet on 30 Mar 2012, 06:05 pm
Replace "player" with "preamp".
Title: Re: New Preamp: LS 100 and Options!
Post by: Alleye on 11 Apr 2012, 02:07 am
Slightly mixed emotions to read the "news" post at 6moons...

http://www.6moons.com/news/news.html

Thrilled to see that the DAC upgrade is ready to roll, but then I was a little bummed to read that the board upgrade can't be done by the end user.

I guess I missed that tid bit in all the other discussions...

Either way, it looks like my LS100 will be taking a trip in the near future.

If anyone has heard the upgrade please pass along the feedback!
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 15 Apr 2012, 08:36 pm
Sorry, but DAC design is modular and as it turned out, while the phono is a single board, using existing power supplies, the DAC includes a separate dedicated supply, USB input board and combination DAC, input receiver and voltage regulator board, that are all assembled and wired into the unit at the factory.

The end result IS WORTH THE WAIT!  It has taken far longer than expected to complete, but I am VERY pleased with the results!

Thanks!

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: nnck on 4 May 2012, 04:12 pm
Dan- I think you missed my question above. I think I know the answer, but I really wanted to check to be sure:

"Dan-

Am I right in still assuming that the DAC input is NOT am option for those of us using the optional phono stage? I mean, there is no way of easily converting one of the other inputs to accept the new DAC?

I'm not willing to give up my phono stage, but it would be nice to try the DAC too."
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 5 May 2012, 02:29 am
The LS 100 will only allow for optional DAC OR Phono upgrade.

The KWI 200 Integrated, our SS 200W integrated DOES allow for both DAC and phono and is on of our top sellers right now!

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: wilsynet on 15 May 2012, 07:51 pm
Any update as to when the DAC upgrade option for the LS-100 will be available?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 16 May 2012, 02:11 am
It is available now!

Thanks!

Dan

Title: Re: New Preamp: LS 100 and Options!
Post by: Daedalus Audio on 11 Jun 2012, 05:09 pm
I have to say that after using the LS-100 with the new DAC module at the Newport show..........
 it is stupid good!!! :thumb:

a world class tube pre and DAC for a fraction of what you would expect to pay!

 great work Dan!
Title: Re: New Preamp: LS 100 and Options!
Post by: mav52 on 6 Mar 2013, 04:52 pm
are there any details about the DAC module ?
 never mind found the info :duh:
Title: Re: New Preamp: LS 100 and Options!
Post by: mg8 on 23 Oct 2013, 10:40 pm
The LS 100 will only allow for optional DAC OR Phono upgrade.

The KWI 200 Integrated, our SS 200W integrated DOES allow for both DAC and phono and is on of our top sellers right now!

Thanks,

Dan

Is the LS100 DAC the same as the KWI-200 DAC?
Title: Re: New Preamp: LS 100 and Options!
Post by: modwright on 17 Nov 2013, 07:31 pm
Sorry for the late reply here.....

The DAC module itself is the same in both units, but in the LS 100, it is Lundahl transformer coupled to the tube circuitry in the preamp.  This is why it is more expensive.  As such, it is then a tube DAC.

In the KWI 200, the gain stage is the preamp stage of the KWI 200, which is SS.

Thanks,

Dan
Title: Re: New Preamp: LS 100 and Options!
Post by: JMosch on 21 Jan 2014, 08:34 pm
Hello All,

I know this topic does not get that many posts, but I was hoping to get some idea of what folks with the LS-100 w/phono are doing with their mono LPs. This is the one area where I feel that Dan may have dropped the ball a little, ie. a lack of a mono switch.

Playing mono LPs (stereo cart) with L+R summed has some significant advantages with the most obvious being a reduction in noise due to out-of-phase components picked up by the L and R signals that get summed. Way back (around 10 years ago) I used to use double Y-connector cables to sum L+R and then split the signal to the L and R phono inputs. Then I got a phono pre with a mono switch (ARC PH5). Not sure if the Y-connector method is the best way to go and I was wondering if Dan has thought about this or dealt with this issue with other customers.

BTW, the LS-100 phono section runs rings around the PH5. I'm using a Tele 12AT7 with a RCA 12AU7 and the depth is stunning, its also very quiet. The whole thing has put me in a state of shock for the price. Its a very impressive package all the way through.
Title: Re: New Preamp: LS 100 and Options!
Post by: roscoeiii on 22 Jan 2014, 02:54 am
Hello All,

I know this topic does not get that many posts, but I was hoping to get some idea of what folks with the LS-100 w/phono are doing with their mono LPs. This is the one area where I feel that Dan may have dropped the ball a little, ie. a lack of a mono switch.

Playing mono LPs (stereo cart) with L+R summed has some significant advantages with the most obvious being a reduction in noise due to out-of-phase components picked up by the L and R signals that get summed. Way back (around 10 years ago) I used to use double Y-connector cables to sum L+R and then split the signal to the L and R phono inputs. Then I got a phono pre with a mono switch (ARC PH5). Not sure if the Y-connector method is the best way to go and I was wondering if Dan has thought about this or dealt with this issue with other customers.

BTW, the LS-100 phono section runs rings around the PH5. I'm using a Tele 12AT7 with a RCA 12AU7 and the depth is stunning, its also very quiet. The whole thing has put me in a state of shock for the price. Its a very impressive package all the way through.

Just get a mono cart, and you'll be fine... :thumb:
Title: Re: New Preamp: LS 100 and Options!
Post by: SoCalWJS on 16 Jun 2014, 02:23 pm
I am trying to find out what the output impedance of the LS100 is and I can't find it so far. It may be in this thread, but I am unable to open page three - I get a message that malware has been found on page 3 from gregdooley.com, and Google Chrome blocks it.

Does anybody know the output impedance of this preamp?

(I feel like I asked this question awhile back, but I can't remember it and I forgot to write it down  :oops:)
Title: Re: New Preamp: LS 100 and Options!
Post by: Audioclyde on 16 Jun 2014, 08:33 pm
I am trying to find out what the output impedance of the LS100 is and I can't find it so far. It may be in this thread, but I am unable to open page three - I get a message that malware has been found on page 3 from gregdooley.com, and Google Chrome blocks it.

Does anybody know the output impedance of this preamp?

(I feel like I asked this question awhile back, but I can't remember it and I forgot to write it down  :oops:)

From the manual on the Modwright website, 300 ohms....
Title: Re: New Preamp: LS 100 and Options!
Post by: SoCalWJS on 17 Jun 2014, 03:44 am
From the manual on the Modwright website, 300 ohms....
Thank you - now I see it in the manual .
Title: Re: New Preamp: LS 100 and Options!
Post by: skriefal on 10 Sep 2014, 04:31 am
How is the HT bypass intended to work on the LS100?  On mine, activating HT/BP from the front panel allows the HT signal to pass through but whichever input that was selected prior to selecting HT/BP also gets mixed in with the HT signal.  If the CD input was previously selected, I'll hear the HT signal plus the CD signal mixed together (assuming that the CD is still playing, of course!).  Is this the intended behavior?  Thanks!