My 67 Starfire1 is a'buzzin' & a'hummin'

Yggdrasil

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It's always been a little noisy, but it seems worse now.
It's just the bass - Casadys & B30E exhibit no hum.

Salient points:

1) volume full up, tone full bass = no hum.
2) putting fingers on the strings reduces it.

Any suggestions?
 
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edwin

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Sounds like a loose ground wire somewhere. I'd start at the output jack and work my way into the bass. Turning the tone fully counter clockwise probably just masks the hum.
 

fronobulax

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Not quite the same symptoms but those are similar to what happens in a room with the lights on and controlled by a dimmer switch. I'd trace the ground first, though.
 
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