AudioCircle

Audio/Video Gear and Systems => Tube-o-phile Circle => Topic started by: happyrabbit on 11 Feb 2017, 02:53 am

Title: 45 Luv
Post by: happyrabbit on 11 Feb 2017, 02:53 am
Back in the 45 family again  :green:  This 45 SET is a mix of old and new.  The amp is based on the KORNEFF circuit (built by Oliver Sayes) using iron from Hashimoto (h-507s). My 1st SET using Hashimoto iron. :thumb:  The drivers are 6p5 and powered by a 5y4.  I have attached a couple pics for your viewing pleasure..

Enjoy

Dwight


(http://www.audiocircle.com/image.php?id=157677)

(http://www.audiocircle.com/image.php?id=157683)

(http://www.audiocircle.com/image.php?id=157679)

(http://www.audiocircle.com/image.php?id=157681)

(http://www.audiocircle.com/image.php?id=157682)

Title: Re: 45 Luv
Post by: roscoe65 on 11 Feb 2017, 03:12 am
Is that brand new?  I have a 421a amp from Oliver and it uses the Hashimoto HC-203U (http://jelabs.blogspot.com/2013/12/hashimoto-hc-203u-se-output-transformer.html) transformer, which is a modern day improved version of the Tango U808.  Its not potted or as pretty as yours though.  My amp is based on Don Garber's Fi 421a and uses Jensen capacitors instead of the sweet Jupiters you have.  But Oliver leaves a lot of space under the hood so there is room to replace them if I want.  It uses a 6SL7 (or 6SN7) and a 5Y4 (or 5Y3) rectifier and a 5998 or WE 421a tube.  Nice 4wpc.
Title: Re: 45 Luv
Post by: happyrabbit on 12 Feb 2017, 03:02 am
yep it's new
Title: Re: 45 Luv
Post by: roscoe65 on 12 Feb 2017, 03:12 am
Oliver has done a number of these based on that circuit.  He likes to use vintage Tamura output transformers from old Sony RTR machines.  Not the best bass in the world, but sometimes smaller transformers can have a magic the big iron doesn't.

I like the old single triode driver tubes.  I have a preamp that uses 27 or56 tubes.  I'm guessing with the 6p5 driver tubes this amp really needs a preamp to get full power out of the 45's.
Title: Re: 45 Luv
Post by: MothAudio on 12 Feb 2017, 03:19 am
Very nice Dwight. I just replaced Exotica TFT caps with Jupiter caps in my 45 amp.
Title: Re: 45 Luv
Post by: happyrabbit on 12 Feb 2017, 04:39 am
The HC-203's were my 1st choice but would not fit...I agree that 'Less is More'.   I debated on using an Oil based over the Jupiter's.  I have used Jupiter Cu's in my MHDT DAC with positive results.  6p5 use all the gain from my 14db tube preamp. :green:

thank you roscoe65 / mothaudio for your comments and insight  :thumb:

Dwight
Title: Re: 45 Luv
Post by: roscoe65 on 12 Feb 2017, 05:07 am
I was envious of your outputs until your comment:  I thought they were the H-20 at first.  Yours are pretty small.  But with the 45 that isn't much of a problem since the higher impedance give you greater inductance.

My H203's are a "cost down" version of the H20.  End bells instead of potted and flying leads instead of terminals.  It also has a slightly different core which results in slightly lower inductance.  They were already installed when I bought the amp (Oliver had it in his system at the time.  I was inquiring about a 2A3 amp he was selling and he offered this as an alternative).  I believe that Don Garber now uses the H-20's in his Fi 421A, replacing the Magnequest DS-025's he originally used.  I had a pair of DS-50's about 20 years ago that I was going to use for a 4 amp.  The Hashimoto's are a bit larger and of equal or better quality. 
Title: Re: 45 Luv
Post by: sfox7076 on 12 Feb 2017, 11:34 am
I live right near oliver.  I have the luxury of hearing a lot of his work before it leaves.  He has a 26->46 from his system he is considering selling.  It sounds glorious.  1.5Ws won't work for me (and I already have a 10Y to a 300B made with Slagle iron).  I think is all vintage tango iron.  Someone is going to be very lucky to own that amp.  Anyway, we spent some time listening to Slagle Iron vs tango at one point.  We didn't have Hashimoto to listen to at the time.  Would have been a fun time to listen to it all.  I must say if you can get away with 1.5W, the 46 is amazing.  Sounds better than a 45 to me.   
Title: Re: 45 Luv
Post by: roscoe65 on 12 Feb 2017, 01:06 pm
I live right near oliver.  I have the luxury of hearing a lot of his work before it leaves.  He has a 26->46 from his system he is considering selling.  It sounds glorious.  1.5Ws won't work for me (and I already have a 10Y to a 300B made with Slagle iron).  I think is all vintage tango iron.  Someone is going to be very lucky to own that amp.  Anyway, we spent some time listening to Slagle Iron vs tango at one point.  We didn't have Hashimoto to listen to at the time.  Would have been a fun time to listen to it all.  I must say if you can get away with 1.5W, the 46 is amazing.  Sounds better than a 45 to me.   

I remember talking with Oliver about a similar amp - he was looking for more money than I could justify for a flea power amp.  Justifiable, given the PS challenges of DHT drivers, but not in my budget.

Title: Re: 45 Luv
Post by: happyrabbit on 16 Feb 2017, 04:55 am
EML 45 Plate in operation  :thumb:


(http://www.audiocircle.com/image.php?id=157931)


Title: Re: 45 Luv
Post by: sfox7076 on 16 Feb 2017, 02:54 pm
Yes.  Cost is hard.  That said, I find myself (in the past, not now), wishing I had spent more on the amp and less on the tubes.  Properly designed, swithing the tubes is like tuning the amp a bit.  The iron does what you want it to and gives you that awesome tone.  The tubes refine it.  My 300B collaboration with Oliver has some mild changes with different 300Bs and 10s, but nothing as significant as changes in out put iron or the like.  We listened to a 10Y-->300B with Tango iron and with Slagle iron side by side.  Same tubes.  Were there differences?  Absolutely.  Was it big?  Not at all.  Kind of a neat experience. 
Title: Re: 45 Luv
Post by: FullRangeMan on 16 Feb 2017, 03:50 pm
Congratulations Dwight. Whats your speakers?
Whats are your sound impressions?
Title: Re: 45 Luv
Post by: sonicboom on 16 Feb 2017, 08:32 pm
Yes.  Cost is hard.  That said, I find myself (in the past, not now), wishing I had spent more on the amp and less on the tubes.  Properly designed, swithing the tubes is like tuning the amp a bit.  The iron does what you want it to and gives you that awesome tone.  The tubes refine it.  My 300B collaboration with Oliver has some mild changes with different 300Bs and 10s, but nothing as significant as changes in out put iron or the like.  We listened to a 10Y-->300B with Tango iron and with Slagle iron side by side.  Same tubes.  Were there differences?  Absolutely.  Was it big?  Not at all.  Kind of a neat experience.

Can you please elaborate a bit on the differences heard between the Tango and Slagle iron? Were the two OPT's similar in size, load impedance and wattage?
Title: Re: 45 Luv
Post by: happyrabbit on 17 Feb 2017, 05:54 pm
FullRangeDude !

currently using Raven's from Birch Acoustic.  lovely speakers.  Vapor meets Omega.

To me , the 45 is holographic + resolved with a touch of romance  :wink:

YMMV

Dwight


(http://www.audiocircle.com/image.php?id=157981)
Title: Re: 45 Luv
Post by: FullRangeMan on 17 Feb 2017, 06:24 pm
Wow great FR line array speakers, I though they had only the Robin, its site is odd to surf.
How they sound w/only 2W?
Title: Re: 45 Luv
Post by: happyrabbit on 17 Feb 2017, 10:52 pm
6p5 provides enough gain to get the job done but I could always use the 6j5 if more is needed.   The Raven's are 96db which is workable with the 45.  I also broke down and had a custom stand made..having your set amp on da floor is silly

Dwight


(http://www.audiocircle.com/image.php?id=158009)


Title: Re: 45 Luv
Post by: MothAudio on 19 Feb 2017, 12:40 pm
I also broke down and had a custom stand made..having your set amp on da floor is silly

Dwight


(http://www.audiocircle.com/image.php?id=158009)

Agree. I cringe whenever I see expensive tubes exposed sitting on the floor like that. Plus I admit, as a visual artist, I enjoy the view too much to have them down low.
Title: Re: 45 Luv
Post by: MothAudio on 19 Feb 2017, 12:42 pm
Can you please elaborate a bit on the differences heard between the Tango and Slagle iron? Were the two OPT's similar in size, load impedance and wattage?

Curious how these stack up to what I'm using... Electra-Print BE5KB 3k OPT
Title: Re: 45 Luv
Post by: roscoe65 on 19 Feb 2017, 01:04 pm
Curious how these stack up to what I'm using... Electra-Print BE5KB 3k OPT

That would have to be tested in an identical circuit.  There are transformer shootouts from time to time (the most recent I've seen is a budget transformer shootout over at JELabs between Edcor and Noguchi transformers) but not as frequently as there were about 20 years ago or so, when SET's were mostly DIYor custom.  The problem is that a real shootout of all or most available transformers would require us to have $5,000 of iron available to swap into a circuit.

Given a reputable hand winder and the materials and tech that are accepted to perform well, it becomes a matter of choice.  Your Electraprint iron is of good reputation but does fall into the lower (but not lowest) price range.  One advantage of EP iron is like many US manufacturers you can specify exactly the iron you would like within the confines of their factory capabilities.  The partial silver secondaries seem to be a particular bargain.

20 years ago we could choose from the big Japanese names (Tango, Tamura, etc.), Audio Note, Bartilucci, Magnequest, Lundahl, Electraprint, and some custom options available from Cary (Audio Electronics Supply - probably Edcor), Edcor and a handful of others.  Today, Tango is gone (RIP 2013), AES no longer exists, but we have access to a large Chinese manufacturing sector (for better or worse) and newer players have come on the scene, such as James (Taiwan) and the renewed availability of Hashimoto/Sansui (Japan).  We can pick almost any price point and specification from $50 to $750 for the typical 2A3/300B transformer.

Personally I like Hashimoto, but Shindo uses Lundahl and others like Wavelength use Magnequest.  Decware uses Edcor (I think) and Fi has switched from Magnequest to Hashimoto.

But to speak more directly to your question, this test hints at the relative quality of Electraprint:  http://www.meta-gizmo.org/Tri/vtv-se.html
Title: Re: 45 Luv
Post by: FullRangeMan on 19 Feb 2017, 01:37 pm
You can try Ogonowski from Poland, he also supply trafos for Lampizator amps, very inexpensive OPTs:
http://www.ogonowski.eu/transformers/single-ended/
Or AC member E55l2 from Netherlands an expert w/+20years experience for the best custom made as nanocristaline or M6 0,01mm:
http://www.audiocircle.com/index.php?action=profile;u=88078
Title: Re: 45 Luv
Post by: MothAudio on 22 Feb 2017, 01:47 am
Thanks Roscoe. VTV, miss those guys.
Title: Re: 45 Luv
Post by: roscoe65 on 22 Feb 2017, 02:02 am
Thanks Roscoe. VTV, miss those guys.

I have always been on the fringes of the SET movement, but have been involved since the mid 1990's.  I'm not sure how I found out about it but was a subscriber to Sound Practices and am still on the Joelist email blast.  The Sound Practices guys have stayed in the game, and some can be found in mainstream publications (Herb Reichert) but most are on some of the other, older forums online.
Title: Re: 45 Luv
Post by: sfox7076 on 22 Feb 2017, 04:20 am
It is hard to describe the difference.  First, the iron was rated at the same impedance, but I did not think to ensure the.  The tango was XE-20s at 5k.  Slagle was iron good for 10 watts on nickel core.  Both were awesome.  I would say slagle's was more transparent, while the tango had slightly better top end extension and realism.    Hard to characterize it. 
Title: Re: 45 Luv
Post by: Docere on 26 Feb 2017, 06:44 am
I have not been here for a while... your system appears to have undergone a few changes. Looking good!

That amp looks like a well-executed traditional-style build; clean. Should provide years of enjoyment.

Cheers.
Title: Re: 45 Luv
Post by: kevtn8 on 13 Mar 2017, 04:22 am
That would have to be tested in an identical circuit.  There are transformer shootouts from time to time (the most recent I've seen is a budget transformer shootout over at JELabs between Edcor and Noguchi transformers) but not as frequently as there were about 20 years ago or so, when SET's were mostly DIYor custom.  The problem is that a real shootout of all or most available transformers would require us to have $5,000 of iron available to swap into a circuit.

Given a reputable hand winder and the materials and tech that are accepted to perform well, it becomes a matter of choice.  Your Electraprint iron is of good reputation but does fall into the lower (but not lowest) price range.  One advantage of EP iron is like many US manufacturers you can specify exactly the iron you would like within the confines of their factory capabilities.  The partial silver secondaries seem to be a particular bargain.

20 years ago we could choose from the big Japanese names (Tango, Tamura, etc.), Audio Note, Bartilucci, Magnequest, Lundahl, Electraprint, and some custom options available from Cary (Audio Electronics Supply - probably Edcor), Edcor and a handful of others.  Today, Tango is gone (RIP 2013), AES no longer exists, but we have access to a large Chinese manufacturing sector (for better or worse) and newer players have come on the scene, such as James (Taiwan) and the renewed availability of Hashimoto/Sansui (Japan).  We can pick almost any price point and specification from $50 to $750 for the typical 2A3/300B transformer.

Personally I like Hashimoto, but Shindo uses Lundahl and others like Wavelength use Magnequest.  Decware uses Edcor (I think) and Fi has switched from Magnequest to Hashimoto.

But to speak more directly to your question, this test hints at the relative quality of Electraprint:  http://www.meta-gizmo.org/Tri/vtv-se.html

Roscoe,

I'm thinking of ordering Oliver's SE 46 amp and have allocated a budget of 3k for this custom amp. I need some help in deciding what transformers to use for the output. Oliver has suggested either the Tango/Hashimoto or the Dave Slagle nickel. My friend have suggested why not Lundahl?  The sound that I'm striving for in this amp is sweet but crystalline highs, a balanced and neutral midrange and clear and deep bass. What is your recommendation on output transformers? To put things in perspective this amp will be replacing a Decware SE84UFO2 that I've had for awhile now but I've heard some good things about the 45 and 46 tubes and I think I have the right speakers for them. Hopefully I can get some clarity here. Thanks in advance.

Kevin
Title: Re: 45 Luv
Post by: FullRangeMan on 13 Mar 2017, 05:44 am
Tango/Hashimoto usually use small core=low power handling. Not sure if this is relevant on a flea power 45.
Title: Re: 45 Luv
Post by: sfox7076 on 13 Mar 2017, 11:21 am
The cost of the tango iron is near the top end of your budget.  Tango stuff has gone over the moon of late.    Lu Dahl output iron is not impressive to me. Slagle and tango are close.  Tango is tracking more expensive than slagle right now.
Title: Re: 45 Luv
Post by: roscoe65 on 13 Mar 2017, 01:31 pm
Tango =/= Hashimoto.

I can't comment directly on the Tango vs, Slagle comparison.

The Hashimoto transformers are excellent.  I have a pair of H203U' sin my 421A amp.  This is the spiritual successor to the old Tango U808 "universal" transformer.  I recall a comparison in Sound Practices about 25 years ago with this transformer.  At that time they preferred most other transformers, including the Magnequest DS-025 and especially the FS-030.  However, Joe Esmilla vastly preferred the Hashimoto to the Tango.

For what it's worth, Don Garber has been using Magnequest iron forever, but has somewhat recently switched to Hashimoto.  The pricing is comparable so I would have to assume that it is a performance factor.

My personal recommendation is to ask for Oliver's opinion.  He has had a lot of experience with this circuit and if you convey what is musically important to you the two of you can probably arrive at a choice that will make you happy.
Title: Re: 45 Luv
Post by: shooter on 13 Mar 2017, 07:21 pm
The 80% nickel Slagle iron are wonderful, also they can be regapped to suit your amp, sometime text book formula may not be the best for every system.
the Tango U808 is musical but not in the same league as the Tango Permalloy or the Slagle nickel.
If someone wants a pair of Tango U808 I have a pair available!
Title: Re: 45 Luv
Post by: sfox7076 on 13 Mar 2017, 10:12 pm
I use the slagle nickel in my 300B amp.  oliver has Tango.  They are very close.  The Tango Oliver using had about 10 years use when we listened.  Slagle iron had about 10 hours.  IMHO Parts of the Tango presentation of the upper midrange were better.  Low end and highs better on Slagle iron.  YMMV.  Also, the B+ On the Slaglewas lower at the time. Not sure that had an effect.  Switch error.  (My amp will run 300B, 275A and 6A3 tubes). 
Title: Re: 45 Luv
Post by: kevtn8 on 14 Mar 2017, 06:15 am
Thanks for all of the feedback guys. Well I guess it comes down to Tango, Hashimoto, or Slagle nickel. Interesting that these are the 3 choices that Oliver offered me. I"ll email him and finalize my decision based on his circuit and my musical tastes.

Kevin
Title: Re: 45 Luv
Post by: FullRangeMan on 14 Mar 2017, 03:07 pm
Oh nice, keep us posted :thumb:
Title: Re: 45 Luv
Post by: Abszero on 15 Mar 2017, 01:42 am
FullRangeDude !

currently using Raven's from Birch Acoustic.  lovely speakers.  Vapor meets Omega.

To me , the 45 is holographic + resolved with a touch of romance  :wink:

YMMV

Dwight


(http://www.audiocircle.com/image.php?id=157981)
Happyrabbit,
I can't agree more with your description of the 45.
I am listening now to my recent built 45-76 amp. Used James transformer that I find a very good compromise price quality.
I am using a 01A preamp to get a little gain needed for a 3Vrms input sensitivity amp.
I am enjoying so much this combination. My speakers are Alpair 12P by Mark Audio.
Cheers,
Radu
(http://www.audiocircle.com/image.php?id=159254)
Title: Re: 45 Luv
Post by: happyrabbit on 18 Mar 2017, 06:32 pm
Radu !

Thanks for the pic !  45 FTW  :green:
Title: Re: 45 Luv
Post by: FullRangeMan on 18 Mar 2017, 06:38 pm
Unusual a toroidal power transformer for tubes.
(http://www.audiocircle.com/image.php?id=159254)
Title: Re: 45 Luv
Post by: Docere on 19 Mar 2017, 06:27 am

Happyrabbit,
I can't agree more with your description of the 45.
I am listening now to my recent built 45-76 amp. Used James transformer that I find a very good compromise price quality.
I am using a 01A preamp to get a little gain needed for a 3Vrms input sensitivity amp.
I am enjoying so much this combination. My speakers are Alpair 12P by Mark Audio.
Cheers,
Radu

Radu, your amp deserves a topic of its own - maybe start a dedicated thread? Beauty is more than skin deep - do you have any shots of the internals?

Cheers.
Title: Re: 45 Luv
Post by: sfox7076 on 19 Mar 2017, 12:12 pm
I have the fortune of having dealt with both Radu and Oliver.  Both make really great stuff.  I think the circuits and build philosophies are somewhat different and the iron used is always different.  That said, the results of both are undeniably awesome.  Radu has a blog with his stuff on it.  https://simplepleasuretubeamps.wordpress.com/   
Title: Re: 45 Luv
Post by: happyrabbit on 21 Mar 2017, 02:08 am
Mr Oliver's current system  :thumb:


(http://www.audiocircle.com/image.php?id=159506)
Title: Re: 45 Luv
Post by: FullRangeMan on 21 Mar 2017, 02:20 am
Any information on that speaker?
Title: Re: 45 Luv
Post by: sfox7076 on 21 Mar 2017, 02:45 am
It's a coral beta 10.   
Title: Re: 45 Luv
Post by: FullRangeMan on 21 Mar 2017, 02:52 am
Wow a refined taste, thanks.
Title: Re: 45 Luv
Post by: roscoe65 on 21 Mar 2017, 11:13 am
It's a coral beta 10.

If I'm not mistaken it also has a matching passive radiator.
Title: Re: 45 Luv
Post by: sfox7076 on 21 Mar 2017, 02:28 pm
Yes.  They are stock speakers from the 70s as I understand it.
Title: Re: 45 Luv
Post by: doggie on 25 Mar 2017, 02:37 am
I have the fortune of having dealt with both Radu and Oliver.  Both make really great stuff.  I think the circuits and build philosophies are somewhat different and the iron used is always different.  That said, the results of both are undeniably awesome.  Radu has a blog with his stuff on it.  https://simplepleasuretubeamps.wordpress.com/

+1

I bought a 301A preamp from Radu that was really well built. He does really good work.
Title: Re: 45 Luv
Post by: happyrabbit on 2 Apr 2017, 04:06 pm
Radu's pre looks awesome  :thumb:

Mr Oliver is attempting a dht pre based on the EML 20 to drive my 45..  Choke Loaded, D.C. Filament


(http://www.audiocircle.com/image.php?id=160282)


(http://www.audiocircle.com/image.php?id=160283)



Title: Re: 45 Luv
Post by: Docere on 11 Apr 2017, 06:20 am
Hi rabbit,

Quick question... just to take it off topic in a different direction... :D Do you get enough volume from the Type 45 SET into the Birch Ravens? I'm thinking of doing something similar (well, similar efficiency, no crossover) and your opinion would be helpful.

Cheers.
Title: Re: 45 Luv
Post by: happyrabbit on 12 Apr 2017, 09:25 pm
Before the Raven's , I had owned a couple high eff speakers from Omega.  2 watts is more than enough.  I feel the output transformers are critical and worth the extra $$$$ .     Recently installed a Mullard GZ32 from 1966..  great rectifier   :thumb: 

Dwight


(http://www.audiocircle.com/image.php?id=160853)
Title: Re: 45 Luv
Post by: Docere on 13 Apr 2017, 10:06 am
Before the Raven's , I had owned a couple high eff speakers from Omega.  2 watts is more than enough.  I feel the output transformers are critical and worth the extra $$$$ .     Recently installed a Mullard GZ32 from 1966..  great rectifier   :thumb: 

Dwight


Thanks Dwight - I may just give it a crack once I get my next amps built. I hope you are right re the transformers... I have 2x ~5.5kg of custom nano-c core awaiting my build - plenty of inductance and wide bandwidth. Power supply probably matters too.

Cheers!

Title: Re: 45 Luv
Post by: happyrabbit on 10 May 2017, 12:34 am
Docere,

45's driving 92db monitors from dc10audio..  :green:

Dwight


(http://www.audiocircle.com/image.php?id=162022)
Title: Re: 45 Luv
Post by: guf on 10 May 2017, 01:14 am
Whoa!? some one else with dc10 audio? cool.
Title: Re: 45 Luv
Post by: happyrabbit on 11 May 2017, 02:23 am
It feels good to be in the dc10audio family  :thumb:


(http://www.audiocircle.com/image.php?id=162104)
Title: Re: 45 Luv
Post by: roscoe65 on 11 May 2017, 03:28 am
Is that a 5" Lowther with a phase plug?
Title: Re: 45 Luv
Post by: happyrabbit on 11 May 2017, 04:23 am
http://www.ebay.com/itm/332187963003

Dwight
Title: Re: 45 Luv
Post by: roscoe65 on 11 May 2017, 01:52 pm
It looks like a Lowther DX55 with a different phase plug, but I can't be sure without seeing under the hood.  If the speaker is rated 92dB, I would imagine the Lowther is crossed over at 6dB/octave to knock down some of its midband peak.
Title: Re: 45 Luv
Post by: Brad on 11 May 2017, 01:54 pm
Love the 45 tube.

I finally got a chance last week to get a pair of the EML solid plates, in place of my vintage 45 output tubes.
Wow, what a difference, in my Korneff.
Title: Re: 45 Luv
Post by: FullRangeMan on 11 May 2017, 02:28 pm
Love the 45 tube.

I finally got a chance last week to get a pair of the EML solid plates, in place of my vintage 45 output tubes.
Wow, what a difference, in my Korneff.
Interesting, I look forward your sound impressions.
Title: Re: 45 Luv
Post by: Docere on 20 May 2017, 05:15 am
It looks like a Lowther DX55 with a different phase plug, but I can't be sure without seeing under the hood.  If the speaker is rated 92dB, I would imagine the Lowther is crossed over at 6dB/octave to knock down some of its midband peak.

Hard to tell, but I doubt it is a Lowther. Tang Band W5-2143 looks to have a more likely surround, phase plug, whizzerless... and cost. Could feasibly be used in "92db"sensitive speakers. Apparently really nice sounding drivers, especially for the price.

Cheers.
Title: Re: 45 Luv
Post by: roscoe65 on 20 May 2017, 11:00 am
Hard to tell, but I doubt it is a Lowther. Tang Band W5-2143 looks to have a more likely surround, phase plug, whizzerless... and cost. Could feasibly be used in "92db"sensitive speakers. Apparently really nice sounding drivers, especially for the price.

Cheers.

You're 100% correct.  Looking at the response curve it gives an honest 93dB above 300hz or so.  I could see this used successfully in a two-way with a first order crossover at 300hz or so.  You would get a the entire midrange and upper frequencies out of a single driver.  The lens/phase plug could be used to tame some nasties up around the 10khz range.

I think Tangband is underrated and is a good choice some interesting DIY designs.  I like that they have a good range of high efficiency, wide band drivers.
Title: Re: 45 Luv
Post by: Brad on 20 May 2017, 12:47 pm
Interesting, I look forward your sound impressions.

I've only had 3 listening sessions so far, but the EML Solid Plates are better, in just about every way, than the vintage 45s I was using.  Bass is more solid, midrange clearer, highs more extended.  Overall presentation is more stable.   Vocals are more lifelike, I'm hearing more details than before.  These were not cheap, but I think they are well worth the money.
Title: Re: 45 Luv
Post by: FullRangeMan on 20 May 2017, 01:39 pm
Thankyou for your report.These are good news, finally happend some evolution on tubes sound quality.
Title: Re: 45 Luv
Post by: happyrabbit on 3 Jun 2017, 07:20 pm
Have soldering iron..will upgrade  :green:

Clarity TC 10uf


(http://www.audiocircle.com/image.php?id=163314)


(http://www.audiocircle.com/image.php?id=163316)

Title: Re: 45 Luv
Post by: Docere on 4 Jun 2017, 06:05 am
Looks like you are using the TCs to bypass larger PS capacitors. Curious to know what you think - what are you bypassing and what changes have you noticed?

I have some a set of TCs sitting on the shelf for my whole PS and have been considering whether I should replace and/or bypass them in various potions. I'm jumping the gun even thinking about it - best to wait until my amp is built and settled in before making a decision.

Cheers.
Title: Re: 45 Luv
Post by: sfox7076 on 5 Jun 2017, 03:02 am
I use TCs in my 01A pre.  I used them straight, no bypass.  I find bypass caps to not be worth the money.  I am taking a break from audio building.  Working on an old laboratory tube "tester" from the 50s. 
Title: Re: 45 Luv
Post by: happyrabbit on 6 Jun 2017, 04:06 am
Docere ,

The TC caps are bypassing the 45's.  the sound field appears to have expanded & move forward a bit.  :thumb:

It appears the C-R-C filter is for the drivers.   I am no expert on the Korneff circuit.

I should have the EML DHT PREAMP next month.. fingers crossed  :roll:

Dwight 
Title: Re: 45 Luv
Post by: Docere on 6 Jun 2017, 09:21 am
Hi Dwight,

Thanks for the info about the sonics! To share right back at you:

The 10uF TCs are bypassing the output stage electrolytic power supply capacitor. That electrolytic capacitor has two separate sections (like two capacitors in one); it has a +ve terminal for each section (2) and a common -ve terminal. Each +ve terminal appears to be connected to the output transformer via a red wire. You can see each TC connected from a +ve terminal of that same electrolytic to ground - the TCs are bypassing the output stage PS capacitors.

The adjacent electrolytic capacitor - connected via the Kiwame (light green) resistor to the output stage electrolytic capacitor - is the driver stage power supply capacitor. You can see the red wires running from the +ve terminals to the driver stage.

The 45 cathodes are bypassed by the 40uF Clarity PX capacitors. You can see them connected to each end of the brown (Mexico manufacture) Mills 12W cathode resistor.

Hope this helps.

Thanks sfox also - good to know about the TCs... I'll run with them for a while.

Cheers,
Ray
Title: Re: 45 Luv
Post by: happyrabbit on 28 Jun 2017, 04:19 pm
Almost done..  :thumb: 


(http://www.audiocircle.com/image.php?id=164626)
Title: Re: 45 Luv
Post by: Slam on 28 Jun 2017, 10:07 pm
I've always wanted to try a 45 amp. I've got a good pair of efficient Omega speakers. Are there any amps that are at or below $1K that are worth trying? I can't seem to find any.

thanks
Title: Re: 45 Luv
Post by: sfox7076 on 29 Jun 2017, 02:19 pm
Oliver's Korneff is where I would go.  I think that is sub $1k.

Hope I get to hear that EML beast before it leaves.  I have to tell you, I am done with resistor volume controls.  TVC all the way.  OK, I will ignore that resistors are all over the place in the rest of the circuit.  Oops.

Shawn
Title: Re: 45 Luv
Post by: roscoe65 on 29 Jun 2017, 04:00 pm
Oliver's Korneff is where I would go.  I think that is sub $1k.

Hope I get to hear that EML beast before it leaves.  I have to tell you, I am done with resistor volume controls.  TVC all the way.  OK, I will ignore that resistors are all over the place in the rest of the circuit.  Oops.

Shawn

Olver's version of the Korneff will only be less than $1k if you choose vintage RTR Tamura transformers.  The cost of new, high quality iron will push the price to $1,200-1,500.
Title: Re: 45 Luv
Post by: happyrabbit on 29 Jun 2017, 08:37 pm
SFOX, 

DHT 71A with TVC's..  It was ok.   Sold it many moons ago.  I gave the TVC's serious consideration but decided against it.

YMMV

Dwight

Slam  - Sent you a link for one on US AUDIO MART.


(http://www.audiocircle.com/image.php?id=164663)
Title: Re: 45 Luv
Post by: Slam on 30 Jun 2017, 11:58 am
Thanks for the link happyrabbit and thanks for the tip sfox7076.

Title: Re: 45 Luv
Post by: sfox7076 on 30 Jun 2017, 01:12 pm
I have to say that I am not a huge 71A fan.  But that's me.  I really prefer the 01A.  Comparing it to a relay driven R2R attenuator, a Khozmo attenuator and a TVC, the TVC won out for me.  But as you say, YMMV. 
Title: Re: 45 Luv
Post by: FullRangeMan on 30 Jun 2017, 04:06 pm
I have a Khozmo 48 steps from Poland.
Post 178/179: http://www.audiocircle.com/index.php?topic=129713.160
How is the TVC sound in your opinion?
Title: Re: 45 Luv
Post by: Docere on 1 Jul 2017, 05:29 am
Almost done..  :thumb: 

Hi Dwight,

Looks interesting - is that the EML20B Oliver was looking into building for you? Is that the PS on the left... or a different amp? What will your system gain be?

And finally, how are those dc10audio working out for? I'm thinking of moving to smaller speakers and keep changing my mind - I really need to write down what is important so I can maintain perspective...

Anyway, it can wait until the new monos are built. Today I completed the drawings/specs for the Delrin sub-chassis and panels... but still have the stainless chassis design and hardware BOM complete.

Your system is coming along nicely - well done.

Cheers,
Ray
Title: Re: 45 Luv
Post by: sfox7076 on 1 Jul 2017, 11:03 am
I find the TVC more detailed than the khozomo.   The one I used was his standard with upgraded resistors. 
Title: Re: 45 Luv
Post by: mkane on 1 Jul 2017, 10:52 pm
I've 2- 45 amps both TSE's. One with EP the other with Edcor Iron. Work great with OB.
Title: Re: 45 Luv
Post by: happyrabbit on 3 Jul 2017, 12:01 am
Docere,

It's the EML 20b DHT PRE by Mr Oliver .  Power supply on the left.   The 20b's mu is ~ 21.  The voltage gain is a bit on the high side but perfect for driving my setup.  :wink:

The dc10 audio speakers are outstanding but the 45 SET limits the speakers to a smaller room.  Please post build pics once you start your project !

And thank you for your kind comments  :thumb:

Dwight



Title: Re: 45 Luv
Post by: drummerwill on 3 Jul 2017, 12:57 am


(http://www.audiocircle.com/image.php?id=164854)

 My 45 amp has a type 26 powered front end and E-P PSSS outputs.

  Willie
Title: Re: 45 Luv
Post by: happyrabbit on 2 Aug 2017, 03:32 am
Da preamp has arrived..  SET meets DHT   :green:


(http://www.audiocircle.com/image.php?id=166333)


Title: Re: 45 Luv
Post by: happyrabbit on 2 Aug 2017, 02:16 pm
Couple more pics of the preamp..


(http://www.audiocircle.com/image.php?id=166340)


(http://www.audiocircle.com/image.php?id=166342)

Title: Re: 45 Luv
Post by: Docere on 3 Aug 2017, 07:57 am
Really nice looking pre Dwight. Your systems looks more than just a little bit special. I'm feeling a little envious right now... but encouraged to take my next leap of faith.

I wish we had some folks doing that kind of stuff near me. Would just love to spend an hour or so listening to some nice tunes over such a system. No tyre-kicking, critical assessment, or tech talk; just listening and enjoying.

Nice work Dwight.

Cheers,
Ray
Title: Re: 45 Luv
Post by: happyrabbit on 18 Sep 2017, 12:23 am
Docere - Thanks for the positive feedback  :thumb: You are welcome @ my place ( aka central Oregon )

Accuton meets 45  :green:

Found the Artos Moomglow on audiogon a couple weeks ago.   2 watts appears enough to drive these gracious speakers from Germany.  1st encounter with the Accuton driver. 

Dwight


(http://www.audiocircle.com/image.php?id=168642)


Title: Re: 45 Luv
Post by: FullRangeMan on 22 Oct 2017, 05:34 pm
Da preamp has arrived..  SET meets DHT   :green:
(http://www.audiocircle.com/image.php?id=166333)
Great photo.