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?
|
Sure. If your schematic lists a resistance for the coil you can check that is in that ball park with the set off.
It may be possible that the adjustments are far enough off that it may not be oscillating.
BTW you should not need to have the output tube plugged in while testing the horizontal oscillator circuit with the set on. All the output does for the osc. is provide a feedback that the phase /AFC system uses to pull the frequency/phase of the osc. into lock, so without that feedback it should free run (which some sam's H adjustment procedures have you force it to do anyway).