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Yes, that sure is a diode. Now I'll throw my two cents in... it sure looks like you have a 'ring' in there somewhere... have you checked the yoke for any caps??? It would be a perfect L-C circuit to oscillate... just a thought. I'll make it four cents... take a trip to a hamfest and buy a decent triggered scope with a calibrated timebase and some high zoot probes... sure would make life easier!!
Best of Luck!!
Jim
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