Other DIY Pass pre amps

[Russellc]

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]

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]

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

Nigel

 

[Russellc]

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]

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]

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]

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]

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 !

Best,

nAr

 

[cjkpkg]

another +1 for the JFETBOZ!

 

[Rudymay1945]

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