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-   -   X0.2 Preamp advice & circuit (http://www.diyaudio.com/forums/pass-labs/124258-x0-2-preamp-advice-circuit.html)

Barry1 4th June 2008 01:13 AM

X0.2 Preamp advice & circuit
 
Want to know which diy preamp design is most similar to the X0.2 and where schematics might be available

Also looking to modify the the input and output coupling caps on an X0.2 and they don't look the same as the X1

In an earlier post Mr. Pass offered this on the X1:

>>There are film input capacitors (1 or 2 uF depending on the rev #) and 220 uF + film bypass on the outputs.

You may replace the caps with the parts of your choice, but of
course you bear the consequences of mistakes.

As the to 220 uF output caps, we are currently favoring the Elna
Silk capacitors, of which there is an inexpensive 220 uF at 16V
available. >>

Values anyone?


Thanks very much!!! Barry

ANADIGIT 15th January 2011 04:41 AM

X0.2 board
 
1 Attachment(s)
I don't have its schematic but I own only its control + suplly + audio board.
Very huge PCB which I never seen before !

I bought from my friend in Spain.

Thanks
Anadigit

ANADIGIT 3rd February 2011 03:35 AM

Now I try to search a good 10uF or 20uF for Pass X0.2 PCB, does anyone suggest me ?

Thanks
Anadigit

Kovax 3rd February 2011 10:03 AM

Simmilar to X0.2 you say?
 
Quote:

Originally Posted by Barry1 (Post 1528382)
Want to know which diy preamp design is most similar to the X0.2 and where schematics might be available

Also looking to modify the the input and output coupling caps on an X0.2 and they don't look the same as the X1

In an earlier post Mr. Pass offered this on the X1:

>>There are film input capacitors (1 or 2 uF depending on the rev #) and 220 uF + film bypass on the outputs.

You may replace the caps with the parts of your choice, but of
course you bear the consequences of mistakes.

As the to 220 uF output caps, we are currently favoring the Elna
Silk capacitors, of which there is an inexpensive 220 uF at 16V
available. >>

Values anyone?


Thanks very much!!! Barry

Well, you can try this ...

http://choky.diyaudio.rs/downloads/T...6%20Shunty.pdf

and the thread is here ...

http://www.diyaudio.com/forums/pass-...ng-thread.html

Highly regarded design thx to Zen Mod.

generg 3rd February 2011 10:47 AM

Try it
 
:) Zen Mods Pumpkin can be driven with no input caps and with 10uF at the output.:D

It is my favorite pre and it is constructed very close to X0.:)

ANADIGIT 3rd February 2011 11:23 AM

I saw too many different between X0.2 & Pumpkin but there're no problem I need only any advice for 10uF CAP, Where can I find AEON CAP ?
X0.2 used additional gain stage above Pumpkin and used X-CIRCUIT only buffer stage not suitable for gain stage !

Thanks
Anadigit

Kovax 4th February 2011 04:28 PM

I hate to do this but ...
 
Quote:

Originally Posted by ANADIGIT (Post 2456016)
I saw too many different between X0.2 & Pumpkin but there're no problem I need only any advice for 10uF CAP, Where can I find AEON CAP ?
X0.2 used additional gain stage above Pumpkin and used X-CIRCUIT only buffer stage not suitable for gain stage !

Thanks
Anadigit

Read this pls ... then google is u best friend ...

http://www.diyaudio.com/forums/pass-...-aleph-x0.html

ANADIGIT 6th March 2011 04:01 AM

Some circuit
 
2 Attachment(s)
I found some schematic from google search.
Could anyone have a correct point ?

Thanks
Anadigit

ANADIGIT 13th April 2011 09:48 AM

Controller
 
1 Attachment(s)
Semi completed preamp.

66 Steps attenuator.
6 Inputs and 2 Outputs.
30 second muting.
Stereo/Mono
Balance/Single End

Next step I'll change 7-Segment display to VFD Display.

Thanks
Anadigit

generg 13th April 2011 09:59 AM

I saw it at the Chinese DIY community......

A bit too complicated for me, the attenuation circuit must be really good, one of the treasures of Nelson.

You do not forget that the circuit is still not given free by Nelson?


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