I cut a small rectangular hole in the back panel of the amp chasis and drilled two tiny mounting holes. Then I mounted a small slider switch from Radio Shack back there.
Then I cut one leg of the cap off the volume pot and left one leg soldered.
I soldered a wire to the pot where I had clipped off the cap lead and ran it back to the switch.
Then I soldered another wire to the free leg of the cap and ran it back to the switch.
Now, when I throw the switch, it either includes the cap in the circuit, or omits it.
It's a very useful mod that really helps dial in the exact tones I like from my
I include the cap in the circuit for my humbucker guitars, and omit the cap for my single coil guitars. It works great!
I know some will cringe at the thought of my cutting a small hole in the back of a vintage amp but, oh well, I love the amp more than ever now and it sees a lot more action these days because of the mod.