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Hokay, how about checking the video detector diode (M4). While you got one end clipped loose, turn the set on and with a clip lead, intermittently short the grid of the 12AU7 1st video stage (V6) pin 2 to ground. Try this with the contrast control at both ends of its rotation. If the two video amp stages are working, there should be some very robust flashing of the raster.
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