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Bassman aa864 guitar channel hum

Posted: 30 Sep 2017, 07:27
by spoontex
Hello,

I've a Bassman aa864 and the guitar channel make hum thru the speaker and I have'nt any guitar sound. The hum interacts with the volumen pot, if I pull of the V3 valve the hum disapear. The bass channel Works well.

I tried to change valves, but the hum persist.

Any idea?

Thanks.

Re: Bassman aa864 guitar channel hum

Posted: 30 Sep 2017, 11:22
by Manfred
Does the hum appear with plugged in guitar or unplugged or in each case.

Perhaps, the input jack is defective over the years.

Re: Bassman aa864 guitar channel hum

Posted: 30 Sep 2017, 11:35
by spoontex
Solved!!

Pin 2 of v3 short with heaters. Yeah!!

Thanks!