More likely that the filter inductor and the tone inductor are talking to each other.? I don't know exactly where they are located on the chassis but I have noticed that high power Peavey 8 ohm to 70 volt line transformers talk to each other when co-located.??
Lots of strange things happen when there is some corrosion between the mounting screw and the chassis.? Loss of a "common" connection or some weird ohmic connection plays havoc with any circuit.
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Friday, February 14, 2025 at 09:37:24 PM CST, don Root <drootofallevil@...> wrote:
Jim, it seems like switching makes the big difference. Presumably there are 3 longer wires running a distance to the switch. Might one of them be getting to close to the B+ wires, or something like that.
Although It hardly matters, the switch is for base “boost” I think, but the boost seems to be bypassed while in the ‘IN” position, and in use while in the “out position”.. confusing to me so far. ??
Jim Whartenby