Can anyone identify the most likely problem?

My Fender Blues Jr. is sending out shaky high notes.
Almost a vibe sound. The lower notes are solid.
This effect only happen on upper register notes.
I've tried scaling back the re-verb. Not much difference.
Any amp techs care to make a guess what is wrong?

Anonymous2013-07-09T22:58:46Z

Favorite Answer

Odd.
And it's definitely not the reverb tank? Sometimes the mounting feet need to be replaced or simply tightened.
Otherwise, my other guess would be the voice coil itself.

10

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