The Penultimate Zen Part 4

gchrist · 5th September 2002, 09:20 AM

Hi to everyone,

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

Thank you

AudioFreak · 5th September 2002, 09:36 AM

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 · 5th September 2002, 11:01 AM

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 · 5th September 2002, 11:47 AM

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

Audioman322 · 12th August 2008, 09:28 AM

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

Nelson Pass · 12th August 2008, 09:42 PM

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 · 26th August 2008, 04:14 AM

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 · 26th August 2008, 08:07 AM

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.

5th September 2002, 09:20 AM	#1
gchrist diyAudio Member Join Date: Mar 2002 Location: Athens Greece	The Penultimate Zen Part 4 Hi to everyone, Does anyone have the circuit board for the power supply for the Penultimate Zen? Thank you

26th August 2008, 08:07 AM	#8
MRupp diyAudio Member Join Date: Dec 2003 Location: Frankfurt area	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. __________________ Martin Rupp

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5th September 2002, 09:36 AM	#2
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	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.

5th September 2002, 11:01 AM	#3
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	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.

5th September 2002, 11:47 AM	#4
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	Oops sorry about that, I misread the original post. Yes, you do not need a power supply PCB for the Zen.

12th August 2008, 09:28 AM	#5
Audioman322 diyAudio Member Join Date: May 2008	Is there any way to increase the gain of zen4 amp up to 10 or so without affecting sonic performance ?

12th August 2008, 09:42 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	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.

26th August 2008, 04:14 AM	#7
Audioman322 diyAudio Member Join Date: May 2008	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?