Hi,
I just finished the build of a Fender Deluxe Reverb clone. The amp works as expected and sounds fine except one issue.
As the gain is increased the amp buzzes only on the low E string. When I inject a signal below 120hz the same condition occurs. I can not see this buzz on my scope. The sine wave is smooth and normal looking.
This happens with different speaker cabinets and different guitars. It occurs on both channels.
There is the possibility it is buzzing at higher frequencies but if it is I can not hear it or see it.
I have done all the normal things like re-solder grounds, change tubes, hold or move around wires.
I just don't know the best way to troubleshoot the issue. Need some advice.Schematic
Link to perhaps a better schematic.
http://schematicheaven.net/fenderamps/deluxe_reverb_ab763_schem.pdfNew heater wiring. NOTE there is next to zero hum in the amp now.
Photo of the amp before the heater wire change.
Thanks,
Billy