Another Project?

[jeyurkon]

I'd be intersted in seeing the sync clipper portion of the schematic if someone could post it.

The grid voltage should probably be about -0.5V. It's usually derived by grid leak from the sync pulse. If the sync pulse isn't getting to it the grid will be too positive and that would give you a low plate voltage.

Or you could have a problem with the 6SN7. It could have a leaky grid. But, in this sense it emits electrons, rather than collecting them from the cathode, so it becomes too positive. You need a tube tester that can check for grid leaks or a special tester like the Sencore LC-2 leak tester.

Not having seen the circuit, I might have said something stupid.

John