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You mentioned L50, but what about the others?
L47,L48,L49? Everything in that area, if you put a 1.5 signal at the grid of V7, (point C) and got no reaction on the screen, with known good tubes and bias within spec, you have a problem from point C to the control grid of the CRT, this will also kill sound, if the video amp has no signal on the plate to give to the sound IF.
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