Quote:
Originally Posted by Jon1967us
Turned out it was a matter of a cold solder joint of the delay line.
Ran a signal through the IF stages and it still was present even going into the Vid amp.
Mechanical movement produced condition starting in the area of the Vid amp, but poking around with a chopstick in the vicinity of the delay line also affected condition. A very very difficult to see cold solder joint was found off the delay line. Possibly someone trimmed this lead too closely at the factory.
Still have a little bit of intermittent color shift, possibly made more apparent just by reflowing the solder joints, and regaining full function of the delay line. Still a bit of work to do, but the set is very watchable now.
The boards in these things are thin and quite prone to faults due to set movement and heat. Honestly, the whole board needs to be gone over with a fine tooth comb.
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I have a HD model. There is a world of difference between the HC and HD.
The HD has the finer dot pattern CRT, but still a low focus type. Different tubes in sweep and HV rectifier.