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I don’t know Andy. I’ve looked this thing over and over and over again. I’ve looked at the wiring of other people’s builds too. I don’t see anything wrong this (see pic). The preamp start ground is highlighted by a green circle. The buss wire is an unnecessary paranoid addition because I was afraid that maybe the pots weren’t contacting the chassis very well. Anyway, the problem remains. Tone pot does nothing. Still get considerable sound with volume turned all the way down. Thoughts? Anyone?
By the way, I was “trained” to ground shielded leads at the jacks/pots, not the tube socket. Also, I learned that the 68k grid stopper(?) should be close to the tube. So, that’s why the shielded leads look the way they do.