tremolo low frequency oscillation problem

[isaac_teller]

Hello. I have a newish Fender Twin. When the tremolo is engaged there is a low frequency oscillation that increases and decreases(in speed, not frequency) with the speed knob. What could cause this and how do I fix it? Thank you.

[acheld]

From your description, it would be hard to distinguish your oscillation from the normal operation of the tremolo circuit.  (I know that is not what you trying to describe.)

Could you provide additional comments or perhaps a sound clip?

[isaac_teller]

It is a low frequency thumping even when there is no guitar signal or even no guitar plugged in.

[tubeswell]

… newish Fender Twin…

More details please. Model number (assuming it’s a ‘Fender’) and/or schematic, gutshot (if it’s a hand wired cloney thing). There could be a multitude of reasons for the problem and without further info, we could be guessing all week.