I recently bought a new pair of 6973 output tubes for my little Gibson amp. They light up but theres no sound! At least I had some sound with my old tubes, so what could be wrong?
You have run up against a “manufacturer’s option.” If you look at the pin-out of the 6973, you will find that both the control grid and the screen can each be tied to two pins. Although it looks like these pins are internally tied together, they are not. The manufacturer has the option of using one of two pins for each of the above elements. To fix your problem, add two jumpers to each tube socket: one from pin-1 to pin-8, and another from pin-3 to pin-6. Your sound should magically reappear!
Related Questions
- I recently bought a new pair of 6973 output tubes for my little Gibson amp. They light up but theres no sound! At least I had some sound with my old tubes, so what could be wrong?
- Why those funny octal preamp tubes? Why not use 12AX7s like every other guitar amp on the face of the earth?
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