Quad 33 hum - only when filters are in use..

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25-Oct-2018 08:34 PM

Jay

Jay

Posts: 33

Hi All,

just a quick question: after having applied the DaDa upgrade kit and pressing either the 5k, 7k or 10k filter keys, a slight, but audible hum can be heard. When pressing Cancel everything seems to be normal again.

Any suggestions on a solution?

Thanks in advance,

J.

 

 

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25-Oct-2018 09:17 PM

Ton

Ton

Posts: 37

Check out this one, Quad 33 hum , perhaps you find a hint in it. Also more "33 hum posts" on the forum. Or try to contact the poster of the 1st hum.

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25-Oct-2018 09:34 PM

Jay

Jay

Posts: 33

Just to clarify: there is no (!) hum source near the 33 at all. Nowhere to be found.......
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28-Oct-2018 12:14 PM

hummph

hummph

Posts: 34

I had the same issue with a revised 33.(the hum may have been there pre revision but I can't remember). The hum was quite faint and not really a problem but two things I did which helped was to 1) Lower the gain (as described in the revision manual)

     2) Clean the switches with contact cleaner.

I have another revised 33 (late serial no) and have had no problems at all.

Ken

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