Quote:
Originally Posted by Kamakiri
Have an issue with hot plating on the horizontal output tube of a CTC-11, and I'm pretty sure that I've traced it to a bad horizontal hold control.
This is described as a sine wave coil. I assume to test it properly the set has to be set up on a scope, but is there any way to test it for an open while out of circuit?
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Not really familiar with the chassis, but looking at the SAMS, to ADJUST it properly requires a scope and adjusting the H osc simultaneously to keep sync.
Out of the circuit, you can check for open with an ohmmeter, but if the problem is a shorted turn instead, that would be hard to tell.
It looks to me like it's the only DC path to the H osc plate. If that is correct, and it's open, the H osc would die completely. Is that what you are seeing with hot-plating? It also means you could check for an open while in-circuit (with power off, of course [adding this comment in case someone less knowledgeable reads this in future]).