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Originally Posted by N9ZQA
Well, unplugged the convergence board, and still no go. Also removed all of the tubes from the high voltage section and looked for inter-element shorts. Didn't find anything of note.
Can the set be operated without any of these tubes in place (HV rectifier, etc?)? I would assume probably not the HV regulator though.
Have an order in for a new damper tube but it won't ship until after Thanksgiving.
Going to pull the yoke off hopefully this weekend and look for burnt spots and see if there is anything I can tell through further examination.
Any way to see if the flyback is the problem? This one seems to be a lot tougher than the one in my other Admiral - it's encased in silicone rubber rather than wax.
Thanks again to everyone for all the help. I'm learning slowly but surely - and I will get this set going eventually.
Jim
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You can safely remove all the HV tubes, including the regulator as long as the HV rectifier is also removed. See if you can get any kind of an arc between the HV regulator plate wire and a screwdriver with an insulated handle (there's no need to ground the screwdriver blade).
There is a test you can do if you have a scope and a square wave generator. You have to disconnect all the wires from it and apply a square wave to one of the windings through a resistor. Monitor this signal on the winding with a scope. A good flyback will ring with each pulse that hits it. Any shorted turns will cause the oscillations to stop very qucikly.
A google search should find a detailed description of this test.