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RE: Pas volume attenuators hum

Posted by petercapo (A) on January 17, 2015 at 17:42:44

In Reply to: Pas volume attenuators hum posted by wgloverr@yahoo.com on January 17, 2015 at 16:36:29:

Hum problems are probably among the most difficult to solve. Are you saying that your hum increases and decreases with the volume control? If so, that kind of makes things easier because it suggests the problem is before the volume control, though it might be some kind of fault with the pot itself. Try shorting plugs on all the inputs and see what that does for the hum. You might also want to have a look at the wiring on the new I/O PCB, in particular the grounds. Did you retain or omit the 10-ohm resistors? The phono input ground should be separate from the other grounds on the I/O PCB. Is there any hum with the volume control all the way down?

Edits: 01/17/15

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