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Phil,
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Regarding the -10v on the grid, that's derived by self-biasing of the tube itself when it's oscillating (same way the Hor osc. self-biases). It's not derived from a separate negative supply.
So if the tube is oscillating, the neg. grid voltage should be there.
If it's not, and there's still a strong signal going out thru T115 (indicating the osc is running), this is strange indeed.. unless maybe the osc quits when you put the meter probe on the grid. What kinda meter are you using?
Last edited by old_coot88; 05-13-2015 at 03:30 PM.
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