Bassman aa864 guitar channel hum

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spoontex
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Post 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.

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Manfred
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Post 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.

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spoontex
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Post by spoontex »

Solved!!

Pin 2 of v3 short with heaters. Yeah!!

Thanks!

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