Magnatone 480A Bias + Plate issue

[FPALB]

The reverb recovery circuit starts with the reverb tank output. Have you tried to short or disconnect it?

Ah, understood. Disconnecting it changes the tone slightly to have more buzz than hum when mixed over to the reverb side. The hum is very very consistent when the reverb depth is at zero (grounded reverb signal).

The reverb foot switch jack is a TRS jack, but im a bit confused on what the circuit is doing - can someone explain? I actually found someone selling what they said is the 480 reverb footswitch and it has a TS jack, which makes zero sense to me as the sleeve (Ground) and the ring (reverb) would be immediately grounded. I dont quite understand what the tip of that jack is doing.

I went around with a chopstick and no changes when pushing on grounds, but I may still go back and reflow everything.



The hunt goes on.

 

[abbey road d enfer]

Grounding the tip attenuates the direct signal by about 15dB. Maybe it's some kind of boost for soloing...?