This one is so freaking easy and totally reversible.... I can't take credit for it, but it works.
On the normal channel of my Pro Reverb, there is a 6800k resistor connected from one wiper on the bass pot to ground. Just snip it on one end, then move it away out of the circuit and your normal channel becomes a screaming gain channel.
I'm going to go back and run a ground line in place of that resistor when I get back in town. What I did worked, but I think it can get better.
With and ABY switch, I now have a nice lead gain channel. Try it. It works.
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