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another odd thing the contrast pot does not do much except at the extreme end so I will look at the 100uf emitter bypass cap as well. I also see a voltage divider used for the base bias, if that 9100 ohm resistor went high then the bias would be fouled up as well. think I will check C501/C503 and the C505/C508 (boost filter on the brightness you mentioned). Will also get voltage readings on that transistor and the CRT pin 1 and the anode.
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