Fender super reverb

[Big chief]

Have a squeal in the reverb when pot is turned above 3. Have replaced tubes, caps.
Any help would be great
Thanks

[Mike_J]

Your situation is not uncommon. Seems like the best success in eliminating the squeal is isolating the reverb jacks from the chassis and grounding them to the ground side of the bypass cap for the reverb section. It can also be caused by electrostatic noise from the power transformer entering the reverb tank. Solution I have seen mentioned is a metal cover surrounding all six sides of the tank to reflect the interference. Have heard of solutions as simple as wrapping the tank in two layers of aluminum foil or a more difficulat and expensive option of making a cover out of mu steel. Either should be placed in the vinyl bag. Location of the reverb tank can sometimes be an issue. Want to check to make sure the output jack of the reverb tank is farther away from the PT than the input is.


This issue has to have come up many times in this and other forums. I would do a search to see what other possibilities exist because those listed above are certainly not exhaustive.


Thanks
Mike

[Big chief]

Thank you very much

[Colas LeGrippa]

iHi,

check the B+ supply cap and resistor. Does the squeal goes away with the treble pot turned counterclockwise ?