Preamp instead of amp question

[dan]

Hi Dan

Gil’s right, and also check this great series of videos from Joe on how to eliminate ground loops.

What is mystery squeal?

When the magnetic field of your picks comes close to the magnetic field of your amplifier’s output transformer, you have made a magnetic feedback loop. This tends to sound more like a squeal than musical feedback. This has nothing to do with the Power Station or attenuators in general. Watch Joe demonstrate the mysterious squeal here: A second type of mystery squeal is caused by having multiple paths to ground: “ground-loops”. Most users will have ground loops and will not even …