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Old 30th November 2009, 04:10 PM   #11
johnm is offline johnm  United Kingdom
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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
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Old 1st December 2009, 09:01 PM   #12
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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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Old 1st December 2009, 09:05 PM   #13
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Quote:
Originally Posted by johnm View Post
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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