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I pulled the damper tube and repeated the flyback test (I also disconnected the HOT plate lead and HV rectifier plate lead as in the previous tests). Same result. It's possible my 1077B is not accurate. I haven't tried this feature before and I don't have any known-good flybacks lying around to check.
I looked again at the 320vdc supply line with the scope. Pulled the vertical output tube and turned brightness down. Same result. The jitters change when I turn the vertical hold control. I used 1x probe both times. The jittering is less pronounced with the vertical output tube absent, but still noticeable.
Capacitors C102 and C104 were previously replaced, along with all other electrolytics and paper caps. I suppose it's possible that one of those two is miswired or defective, although the supply voltages seem about right everywhere that I've checked. I'll keep poking around.
Phil Nelson
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01-06-2012, 10:22 PM
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