My Attempt at Predicta Restoration

[PredictaNoob]

Originally Posted by DaveWM

interesting, that pin is supposed to be connected to the pot, so I assumed it should have done something. See if you can trace the pot to a tube pin.

I don't know what this pot is for now.
I traced the pot to a wire connected a lead for the 400v B+ that jumps over to the that same e-can, hooked to the 10 mfd 450v?

[DaveWM]

hmmm, maybe some kind of rigged up focus control. need more can you tell where each lead goes and I will see if I can find out whats going on. the Lin pot is a cathode bias pot, pin 9 to ground.

[PredictaNoob]

Originally Posted by DaveWM

hmmm, maybe some kind of rigged up focus control. need more can you tell where each lead goes and I will see if I can find out whats going on. the Lin pot is a cathode bias pot, pin 9 to ground.

OK, I traced the two leads coming from the pot. Black goes to ground, red to the post marked "B+ 400 2" the orange and white wire jumps it to another post, then to the electrolytic as described previously. The circuit board path, I outlined with the red line, takes it to pin 9 on the audio out tube, 6BQ5.
Huh?
Tone control, maybe? I thought this might be an audio pot, at least it is similar to tone control pots I've seen in old tube amps.
I really don't know.
Let me know if this picture helps, or if you need me to take some other detailed shots.