This is a prototype amp with no schematic. For a while I have been struggling with the Reverb; the more you turn up the tone of the Reverb, you have to turn down the amount, otherwise it kills the signal, or vice versa. I finally figured out that the closeness of the Reverb tank influences killing the signal. When the tank is installed, so long as the out side is next to the power transformer, and the in next to the output, there are no issues, BUT, there is an insanely loud hum. If you swap it, so the out is next to the output and the in next to power transformer, this is where the problem occurs. I read, the in should be next to the power transformer to minimize hum. Anyhow, being next to the transformers kills the signal in this orientation. The further away the tank from the transformers, the more you can turn up the tone and dwell without killing the signal. The proximity of the tank to the transformers has no effect on the dry signal when the reverb is disengaged/off. Besides building a bigger cabinet, is there any shielding that can prevent this? Perhaps something I missed?