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-   -   Other DIY Pass pre amps (http://www.diyaudio.com/forums/pass-labs/171061-other-diy-pass-pre-amps.html)

Russellc 30th July 2010 02:53 PM

Other DIY Pass pre amps
 
Really like the B-1, but with some speakers a little gain is needed in my setup.
I have seen some older posts ( '05 ) that suggested the P 1.7 or something similar. Anything better since then? Circuit board availability would be a plus! I'm building the Pearl 2, so only line stage is needed.

Russellc

ra7 30th July 2010 03:10 PM

Check out the JFET BOZ thread here... doesn't get simpler than that. Apart from that there's the preamps on the passdiy site... BOZ and BOSOZ.

njepitt 30th July 2010 04:00 PM

There's also juma's BF862 preamp, which I have been very happy with.

Nigel

Russellc 30th July 2010 09:04 PM

Quote:

Originally Posted by ra7 (http://www.diyaudio.com/forums/showthread.php?p=2258228#post2258228)
Check out the JFET BOZ thread here... doesn't get simpler than that. Apart from that there's the preamps on the passdiy site... BOZ and BOSOZ.

I have the board for BOZ already. I'll put that sucker together, I've had those boards since the 90's! (Have the Zen board as well.)

russellc

AirPuncher 19th January 2011 07:08 PM

Am looking for a pcb's or the layouts for the Aleph P 1.7 There was guy in Poland who did some in a simple format some years back rather than the German version still available with all the bells and whistles. Anyone able to help on this.:)

Zen Mod 19th January 2011 07:49 PM

I have pdfs for acaudio.de version

shoot me with PM and I'll send them , if needed

they're too big for forum

Bill Fuss 20th January 2011 10:45 AM

Erno Borbely published a very simple balanced jfet line stage years ago in AX, very elegant and very similar to a Bosoz or P. It sounds excellent and is easy to build. You can find it with a Google search.

nar 20th January 2011 12:48 PM

Quote:

Originally Posted by Russellc (http://www.diyaudio.com/forums/pass-labs/171061-other-diy-pass-pre-amps.html#post2258213)
Really like the B-1, but with some speakers a little gain is needed in my setup.
I have seen some older posts ( '05 ) that suggested the P 1.7 or something similar. Anything better since then? Circuit board availability would be a plus! I'm building the Pearl 2, so only line stage is needed.

Russellc

Don't forget the UGS by CheefDeGaar :) That's what I will test next.

We recently designed a motherboard for the UGS preamp with user PierreQuiRoule, with the following features :
  • Support of any UGS versions modules ( fixation holes and connector pins are true "UGS standard")
  • Integrates circuitry for 6 inputs; 2 balanced 4 unbalanced, has 2 sets of direct parallel outputs, balanced ( bi amp in mind )
  • Versatile use of relay coils DC is possible : 5,12, 24 V ...
  • Only a single Lorlin (external) 2C6POS is needed for relays switching and led signalisation (additional source of DC for the circuitry is also needed)
  • Automatic switch to GND of the minus inputs of the UGS when using unbalanced sources, no headache ( easy unbal to bal converter )
  • Balanced ladder connections are implemented ( 50k, volume before the UGS )
  • Double mono PSU is what we had in mind. However, it is also usable with a single audio power supply ( +/-24V ).

We also re-arranged a little the UGS_V3 layout. Boards about same dims, slightly greater size pads for soldering.

I can't really tell more for now. It's top-secret ! :eek:

Best,

nAr

cjkpkg 20th January 2011 10:33 PM

another +1 for the JFETBOZ!

Rudymay1945 20th January 2011 11:28 PM

+2 for JFETBOZ with Pearl 2. Great combo but you have to manage the gain some.


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