Signal issue on a Motorola 7VT2?

[earlyfilm]

Originally Posted by Kamakiri

I've got full raster, but no signal and no audio. I've got nothing on pin 3 of V1 (6AG5), and ~180V on pin 1 of V2 (12AT7). The overload on V2 is in the neighborhood of the voltage that I should have on V1 that's not there.

The only thing that connects the two pins directly is a small mica, which I robbed out of a parts chassis to no effect. I've done the obvious resistor and cap checks in the vicinity.

Forget your "golden screwdriver treatment" for the moment, you have a circuit wired wrong.

Pin 3 is a filament.

If rest of the set is working, that means the other tube's string filaments are lighting.

Unplug the set and ohm out the filaments in this area.

Pin three should have a choke and not a cap!

James

[Kamakiri]

Originally Posted by earlyfilm

Pin three should have a choke and not a cap!

James

Sure looked like it could've been a mica. In any event, I replaced it with the unit from a parts chassis that was in that exact spot, figuring that the likelihood of both being bad was negligible.