Many thanks for the reply, Enzo.
Here's an SSGuitar thread with the schematic for the head version (the 3rd schematic from top; marked 3005 (rather than 5005, which is my combo version)): https://www.ssguitar.com/index.php?topic=3787.15
Ah, right, I shouldn't have questioned the volume pot, since it was doing its job successfully regulating volume.
It's 60Hz.
Again, thanks for replying. This is great.
Here's an SSGuitar thread with the schematic for the head version (the 3rd schematic from top; marked 3005 (rather than 5005, which is my combo version)): https://www.ssguitar.com/index.php?topic=3787.15
Ah, right, I shouldn't have questioned the volume pot, since it was doing its job successfully regulating volume.
It's 60Hz.
Again, thanks for replying. This is great.