The Penultimate Zen Part 4

[gchrist]

Hi to everyone,

Does anyone have the circuit board for the power supply for the Penultimate Zen?

Thank you

 

[AudioFreak]

They are on sale at www.passdiy.com ... alternately, the pattern is in the pdf file and you can use this to make your own boards.

 

[fcel]

I don't think there is a power supply board or that it needs one. You just bolt the bridge rectifier, the capacitor and the transformer to the chassis.

 

[AudioFreak]

Oops sorry about that, I misread the original post. Yes, you do not need a power supply PCB for the Zen.

 

[Audioman322]

Is there any way to increase the gain of zen4 amp up to 10 or so without affecting sonic performance ?

 

[Nelson Pass]

Not really. You can increase the gain, but there is a zero-sum situation
between gain and feedback, so with more gain, there is also more distortion.

 

[Audioman322]

Dear mr.Pass,

Lowering the values of R2/R3 reduces distortion at the top end.
I can accept 10k input impedance, should I try to lower these resistors with zvp3310 to reduce distortion?

 

[MRupp]

FWIW: I use a ZEN V4 with 10 K input resistance and 47 K feedback || 22 pF (and with BS250 instead of ZVP....) and it works just fine. I don't have the schematics in front of me so not sure if they are R2/R3.

From what I remember this mostly increases the BW in the buffer stage and hence the overall circuit.