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Old 5th September 2002, 09:20 AM   #1
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Unhappy The Penultimate Zen Part 4

Hi to everyone,

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

Thank you
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Old 5th September 2002, 09:36 AM   #2
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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.
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Old 5th September 2002, 11:01 AM   #3
fcel is offline fcel  United States
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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.
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Old 5th September 2002, 11:47 AM   #4
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Oops sorry about that, I misread the original post. Yes, you do not need a power supply PCB for the Zen.
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Old 12th August 2008, 09:28 AM   #5
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Is there any way to increase the gain of zen4 amp up to 10 or so without affecting sonic performance ?
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Old 12th August 2008, 09:42 PM   #6
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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.
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Old 26th August 2008, 04:14 AM   #7
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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?
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Old 26th August 2008, 08:07 AM   #8
MRupp is offline MRupp  Germany
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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.
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