S.O.S. I'm getting a rattle from inside my V4B (purchased in the fall) and it's driving me crazy. I can't figure out what it is. Kind of a glassy rattle. I did the test where you tap on the power and pre-amp tubes with a pencil eraser head to see if a tube is about to go. I didn't get a noise out of any tube, which is supposed to be the indicator of a bad tube as I understand it.
Any ideas? The rattle (especially noticeable when I hit a fretted E, F or F# on the A string) is just enough to annoy me and have to deal with.
Thanks.
I always replace the hard plastic feet on my Ampeg amps with softer rubber ones. This has stopped rattles for me - and I believe it could aid in fending off future rattles.

