Revisited Zen

seve · 15th June 2004, 10:17 PM

Hi,

I have decided to build the revisited zen and I am in the proces of gathering the last parts. I have only been able to find a 22K pot and not the 25K pot mentioned in the article will this be a problem?

Also how important is the parallel film caps at the input and output will the sound quality suffer much if I build the amp without them?

My plan is to build the revisited zen first and then the Zen V2. Anybody that have compared these two versions?

Seve

azira · 15th June 2004, 10:29 PM

You should be ok with 22k instead of 25k. It's just a divider to set the bias. Read the biasing instructions carefully.
You absolutely need the input and output caps because this is a single supply circuit. If not you'll try and drive DC back at your source and into your speaker. You could try and get away with fewer caps but that might affect the sound or performance.
--
Danny

seve · 15th June 2004, 11:08 PM

Hi Danny,

Thanks for the help.

I think I understand the biasing but I just did not know if the 22K pot would give me a sufficient range.

Regarding the input and output caps I was not planing to remove them only the film caps that are in parallel with the other caps. In the original Zen articel there was not used any film caps in parallel and I just wanted to hear opinions about the cost-benefit of the caps! I probably will end up using them because they will not cost that much to include.

Seve

till · 15th June 2004, 11:55 PM

You can build without the parallel film caps, and when the amp works add them and tell us if you hear a difference!

seve · 16th June 2004, 11:32 AM

Hi Till,

I probably will do that. I hope to find some good/cheap film caps.

Seve

Nelson Pass · 16th June 2004, 06:17 PM

You are likely to hear them. They were not included in the
original because I leave lily-gilding to DIYers.

seve · 16th June 2004, 09:41 PM

Thanks for the reply Mr. Pass. I will try the zen with and without the film caps in parallel and see what I like the most.

Seve

15th June 2004, 10:17 PM	#1
seve diyAudio Member Join Date: Sep 2002 Location: Denmark	Revisited Zen Hi, I have decided to build the revisited zen and I am in the proces of gathering the last parts. I have only been able to find a 22K pot and not the 25K pot mentioned in the article will this be a problem? Also how important is the parallel film caps at the input and output will the sound quality suffer much if I build the amp without them? My plan is to build the revisited zen first and then the Zen V2. Anybody that have compared these two versions? Seve

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15th June 2004, 10:29 PM	#2
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	You should be ok with 22k instead of 25k. It's just a divider to set the bias. Read the biasing instructions carefully. You absolutely need the input and output caps because this is a single supply circuit. If not you'll try and drive DC back at your source and into your speaker. You could try and get away with fewer caps but that might affect the sound or performance. -- Danny

15th June 2004, 11:08 PM	#3
seve diyAudio Member Join Date: Sep 2002 Location: Denmark	Hi Danny, Thanks for the help. I think I understand the biasing but I just did not know if the 22K pot would give me a sufficient range. Regarding the input and output caps I was not planing to remove them only the film caps that are in parallel with the other caps. In the original Zen articel there was not used any film caps in parallel and I just wanted to hear opinions about the cost-benefit of the caps! I probably will end up using them because they will not cost that much to include. Seve

15th June 2004, 11:55 PM	#4
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	You can build without the parallel film caps, and when the amp works add them and tell us if you hear a difference!

16th June 2004, 11:32 AM	#5
seve diyAudio Member Join Date: Sep 2002 Location: Denmark	Hi Till, I probably will do that. I hope to find some good/cheap film caps. Seve

16th June 2004, 06:17 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	You are likely to hear them. They were not included in the original because I leave lily-gilding to DIYers.

16th June 2004, 09:41 PM	#7
seve diyAudio Member Join Date: Sep 2002 Location: Denmark	Thanks for the reply Mr. Pass. I will try the zen with and without the film caps in parallel and see what I like the most. Seve

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