Feedback capacitor - Page 2

johnm · 30th November 2009, 04:10 PM

Hi - thought I'd re-awaken this thread as I have a 47uF 63V MMK film cap. I was going to use it for the feedback capacitor in a Quad 606, but the folk at DaDa eletronics (Quad service/upgrade specialists) told me a non-polar cap should not be used in this position (C7).

Circuit diagram below:

http://www.dc-daylight.ltd.uk/Valve-...rvice-data.pdf

I'm no expert so thought I'd double check opinion over here, as I've heard replacing eletrolytics is usually desirable in the feedback position?

Thanks,

- John

Spartacus · 1st December 2009, 09:01 PM

I suspect as a service centre they like to keep things standard on principle. A non polar cap will be fine.

nigelwright7557 · 1st December 2009, 09:05 PM

Quote:

Originally Posted by johnm

Hi - thought I'd re-awaken this thread as I have a 47uF 63V MMK film cap. I was going to use it for the feedback capacitor in a Quad 606, but the folk at DaDa eletronics (Quad service/upgrade specialists) told me a non-polar cap should not be used in this position (C7).

Circuit diagram below:

http://www.dc-daylight.ltd.uk/Valve-...rvice-data.pdf

I'm no expert so thought I'd double check opinion over here, as I've heard replacing eletrolytics is usually desirable in the feedback position?

Thanks,

- John

In my amps I just use a standard 47uF electrolytic in the feedback chain just as most other designs do.

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30th November 2009, 04:10 PM	#11
johnm diyAudio Member Join Date: Sep 2003 Location: Hampshire	Hi - thought I'd re-awaken this thread as I have a 47uF 63V MMK film cap. I was going to use it for the feedback capacitor in a Quad 606, but the folk at DaDa eletronics (Quad service/upgrade specialists) told me a non-polar cap should not be used in this position (C7). Circuit diagram below: http://www.dc-daylight.ltd.uk/Valve-...rvice-data.pdf I'm no expert so thought I'd double check opinion over here, as I've heard replacing eletrolytics is usually desirable in the feedback position? Thanks, - John

1st December 2009, 09:01 PM	#12
Spartacus diyAudio Member Join Date: Jan 2002 Location: Cheltenham	I suspect as a service centre they like to keep things standard on principle. A non polar cap will be fine.

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