IIRC there was a 'lytic coupling cap in the video that
caused weak & streaky video.
Check the CRT voltages on cathodes. Should be apx 130V on most
sets. If near 200V you get no raster if everything else OK.
You can force a gun on by grounding a cathode through an
apx 18K resistor. Use the same value as the collector resistors
for the R,G, & B outputs.
Last look for open resistor in G-2. Usually carbon & high value.
73 Zeno
LFOD !