Can you set it up to measure the bias voltage (cathode to control grid)
WHILE OPERATING - be good to find out what is changing.
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On Sat, April 13, 2019 16:37, saipan59 wrote:
I suggest a cold/cracked solder joint could be the issue - influenced by
flexing/shifting when heat builds up. If it "jumps around" between good
and bad, that might rule out a component that has drifted out of spec or
is temp-sensitive.? And if trace brightness is the only thing affected,
then there are only a very limited number of parts that are in the right
area. I doubt that the CRT or electrolytics are responsible for the
behavior you describe.
Pete
