LDRx/LDRxB Passive Preamp Tour - 2014/2015

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jtsnead

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #60 on: 2 Feb 2015, 06:58 pm »
Do not know what happened to goober, but I received a unit today

jtwrace

Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #61 on: 2 Feb 2015, 07:03 pm »
Do not know what happened to goober, but I received a unit today
Well, you're #3 on the list so plug her in and enjoy.   :thumb:

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #62 on: 2 Feb 2015, 07:13 pm »
Do not know what happened to goober, but I received a unit today

Ah, yes, you (jtsnead) were #3 on the list and so provided your address etc. but mistakenly posted audiogoober (who is #4) who gets the unit after you. Somehow it will all work out. Enjoy!

jtsnead

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #63 on: 2 Feb 2015, 07:33 pm »
Will do

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #64 on: 10 Feb 2015, 03:33 pm »
The tour unit is on its way to audiogoober somewhere in the white-out that is New England.  :thumb:

aldcoll

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #65 on: 12 Feb 2015, 01:18 am »
I would like to provide a resting spot in Oregon form the tour.  The proud state with the highest concentration of brew pubs,,,,,so I have been told :thumb: :thumb: :thumb: :thumb:

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #66 on: 18 Feb 2015, 07:40 pm »
audiogoober is wrapping up his tour session and will soon be shipping the LDRxB off to ZLS.

tasar

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #67 on: 26 Feb 2015, 05:20 pm »
Would like to be included on this tour.

Tasar
Traverse City MI 49670

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #68 on: 8 Mar 2015, 02:57 pm »
Just a quick note to let you all know that the LDRxB tour unit is back at Tortuga basecamp for some updating. We'll have that puppy back on the road later this week. That is all.  :D

jtwrace

Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #69 on: 8 Mar 2015, 02:58 pm »
Just a quick note to let you all know that the LDRxB tour unit is back at Tortuga basecamp for some updating. We'll have that puppy back on the road later this week. That is all.  :D
What will the updates do?

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #70 on: 8 Mar 2015, 03:38 pm »
What will the updates do?

The tour unit has a pair of V2 boards. I'm not going to swap them out for V2.1's but I am going to upgrade to the 2.1.x firmware and as part of that run both boards through a one-time pre-calibration sequence using precision 0.1% Dale resistors. The non-LDR hardware in each board has enough inherent spec variation such that the auto-cal results can be off for reasons unrelated to the LDRs themselves. Said differently auto-cal may think it's measuring resistance level R when it's really R times some error factor. Pre-calibration is a way of squeezing out some of that inaccuracy. When you step back from all the details, auto-cal is simply an embedded resistance measuring instrument. Pre-calibration is the calibration of that instrument. The net result is a preamp with more precise channel balance which usually translates into better sound stage and stereo imaging. It's all good!   :thumb:

jtwrace

Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #71 on: 8 Mar 2015, 04:13 pm »
The tour unit has a pair of V2 boards. I'm not going to swap them out for V2.1's but I am going to upgrade to the 2.1.x firmware and as part of that run both boards through a one-time pre-calibration sequence using precision 0.1% Dale resistors. The non-LDR hardware in each board has enough inherent spec variation such that the auto-cal results can be off for reasons unrelated to the LDRs themselves. Said differently auto-cal may think it's measuring resistance level R when it's really R times some error factor. Pre-calibration is a way of squeezing out some of that inaccuracy. When you step back from all the details, auto-cal is simply an embedded resistance measuring instrument. Pre-calibration is the calibration of that instrument. The net result is a preamp with more precise channel balance which usually translates into better sound stage and stereo imaging. It's all good!   :thumb:
Sweet! 

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #72 on: 9 Mar 2015, 04:12 pm »
[moved sub-thread/topic regarding impedance from here to its own topic "Adjustable Impedance"] - http://www.audiocircle.com/index.php?topic=133006.0

konut

Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #73 on: 9 Mar 2015, 10:57 pm »
Just to be clear the tour unit does not, nor will not, have the adjustable impedance feature. Right?

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #74 on: 9 Mar 2015, 11:27 pm »
Just to be clear the tour unit does not, nor will not, have the adjustable impedance feature. Right?

Actually, when it gets back on the road it will indeed have adjustable impedance. I'm going to set up 4 levels in addition to the default 20k (which is 40k balanced). Probably 2k, 5k, 25k and 50k which is 4k, 10k, 50k, and 100k balanced.

konut

Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #75 on: 9 Mar 2015, 11:43 pm »
Thanks Morten! This is a KEY feature.Looking forward to the audition.

tasar

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #76 on: 30 Mar 2015, 01:32 pm »
Would like to be included on this tour.

Tasar
Traverse City MI 49670

Request has had no response, my guess is the "tour" was finite ?

tortugaranger

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #77 on: 30 Mar 2015, 01:52 pm »
Request has had no response, my guess is the "tour" was finite ?

Truth is I put the tour unit on the back burner after updating it and have been distracted with other day-to-day matters. Will get the show back on the road soon and will also add you, tasar, to the tour list. I thank everyone for their patience.

Your one-armed-paper-hanger,
Morten

NachoTime

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Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #78 on: 30 Mar 2015, 03:27 pm »
Hi Morten

I'd love to get on on this tour. 

Recently picked up a W4S dac2 and would like to compare it with the mighty Tortuga.  It would help me to decide on a diy balanced build.

Thanks.
Sten

mikeeastman

Re: LDRx/LDRxB Passive Preamp Tour - 2014/2015
« Reply #79 on: 8 Sep 2015, 01:59 pm »
What is happing with the tour?  :scratch: