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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
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04-02-2010, 11:23 PM
Hybrid Mode
