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Old 28th December 2011, 02:40 PM   #51
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Quote:
Originally Posted by Dukja View Post
Yes, I am pondering whether to go for B1 or DCB1. And exactly as you described, using humble pot first and then upgrade to LDR type. I only need one input and manual control at this moment.

I was just overwhelmed by the 230 pages of DCB1 build thread. And there seems to be also some variant (Hypnotize version??) Do I really need to read through the whole thread to get all the details? or is there somewhere more concise note?

Also, I would appreciate some hint to get good matched JFET. Some posts mentioned about Spencer. Is he a diyAudio member? As you can see, I am just trying get some orientation. Any points to the right direction would be appreciated.

Thanks!

Puck
I would just buy the PCB + matched JFETs from Pass Labs.
However good the DCB1, for a first attempt the original B1 is very easy to build, few parts, and the hardest to find (the matched JFETs) are supplied by the same reliable source (i.e. Pass Labs).
If you like it, you can always build an "ultimate" version (perhaps DCB1) later.
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Old 28th December 2011, 02:42 PM   #52
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If I plug CD player directly into Aleph 4 it is just ALIVE there is no other way to descibe it.

The dynamics are fabulous and it is a pleasure to listen to.

With a passive volume control it lost some of its magic so I tried the B1.

Much better than the Pumpkin in terms of ease of use - SILENT in operation. BUT the Pumkpin has an electric edge that just brings everything to life.
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Old 28th December 2011, 02:44 PM   #53
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DSIR9277.JPGI built my own B1. Its ever so easy.
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Old 28th December 2011, 04:32 PM   #54
Dukja is offline Dukja  United States
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Originally Posted by Russellc View Post
Basically they are the same thing, mez version has multiple inputs with multiple relays, Hypn. version does not, but seems to be heavier made with an eye to really cranking the juice for the ultimate hot rod version.

Russellc
The board sold at diyAudio Store is for Mezmerize version only? Where to get the Hypnotize version?
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Old 28th December 2011, 05:04 PM   #55
Marra is offline Marra  United Kingdom
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I have built both the B1 and DCB1 and imho the DCB1 is a step up in sound quality[sorry Nelson]. More clarity and openness especially when coupled with an LDR type volume control. Because of the dc offset risk I used capacitors on the output but not the input.
Spencer is a forum member and I believe sells matched fets.
If you want to try something totally different TVC's work extremely well although somewhat more expensive.
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Old 28th December 2011, 05:29 PM   #56
Marra is offline Marra  United Kingdom
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Check with Teabag there's a gb on at the moment.
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Old 29th December 2011, 12:16 AM   #57
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Originally Posted by Zen Mod View Post
well , I'm biased
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Old 29th December 2011, 03:05 AM   #58
Dukja is offline Dukja  United States
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Originally Posted by Marra View Post
Check with Teabag there's a gb on at the moment.
Marra, you are the man! I just got almost all I need from TeaBag for DCB1. Thanks a bunch for pointing me to the right direction.

Now, I need to read through all the posts about DCB1...
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Old 29th December 2011, 09:46 AM   #59
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Happy reading
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Old 15th January 2012, 05:18 AM   #60
Dukja is offline Dukja  United States
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OK, I first finished the Uriah's Lighter Note project. I removed all the high value resistor (1M~20Mohm) so basically I just have LRD as a voltage divider. It sound good and nice.

However, I found that if I use Foobar to output 24-bit (to alleviate some loose of bits by digital volume control) and use Win 7 volume control, the direct output of my Audio-GD's Ref (22 ohm Zout) to Aleph 3 (20k Zin) sound still better. Very smooth high and more realistic live feeling with my Hifiman HE-6 headphone.

This really brings up a question: Does my DAC direct output to Aleph3 has better impedance match and hence better sound?

My Lighter Note has a total resistance in the voltage divider of about 7K ohm (shunt + series).

DCB1 will be my next build. But now I really wonder if I "need" to build it.

Oh, the only complain to DAC-> Aleph3 was the pops made by Foobar when I change FLAC on the fly. Sometimes pops were quite annoying, but other times there were none.

Last edited by Dukja; 15th January 2012 at 05:22 AM.
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