#1
I noticed that at the back of my AC30 there's a rattle/vibration when I hit one particular note. G string 7th fret.

It sounds like it's coming from behind the amp, rather than through the front. It only happens on this note and I can't notice any rattle coming FROM the actual guitar.

Ideas?
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I hear they use false bypass switches.

It's, like, so ironic.
#2
Have you tried it in another room? I mean, there could be something in your room vibrating at that frequency.
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Gear

Bach Stradivarius 37G
Charvel So Cal
Fender Dimension Bass
Hartke HyDrive 210c
Ibanez BL70
Laney VC30
Tokai TB48
Yamaha FG720S-12
Yamaha P115
#3
could be a screw vibrating or a microphonic valve... or something else.
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