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electrolytics have been bridged, cathode volts go away when pulled. I can tease more than a half inch arc off the HV rect plate with an insulated driver. Still a vertical line up the screen and yes the yoke is properly level and the vertical hold moves bumps up or down the line. Cathode curent is very low at the HO tube and hdrive is over 50v PP. Freq still seems high. 6SN7 subd, All parts replaced in h osc ckt, trimmer caps have some effect but no where near enough. I even lifted the doorknob cap to verify it wasn't breaking down under voltage. I am suspecting an unortodox failure in the HO transformer due to the fact I have enough drive to light the rectifier but not result in any sweep. Resistance measurments seem very close but we all know how that goes. I subed the yoke on the bench but the H drive remained the same on the scope. I suspect that the HO trans is somehow significant to the H osc freq via feedback somehow. I still need the expertise thats out there I don't know how to post the schematic for the 20Y1 Admiral.
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09-06-2011, 12:51 PM
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