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maybe its a similar problem i had with my sivertone, after checking voltages at the 6bk4 shunt come to find out there was a shorted ceramic disc in the IF section that affected the bias voltage of the shunt tube and kept the hv from rising up to where it belongs. after checking the hv adjust pot and all other related voltages come to find that the shorted ceramic cap was in the shunt tube heater string that only would have affected the crt heater, shunt tube heater, and one other that i dont remember at this point because it took years to find this problem and i dont want to look back on it because it took so long to figure out. and let me point out that i would have never have found this problem if it was not for daveWM . so if anyone is going to get to an unusual problem with one of these sets it will be daveWM. take your time and be sure to check even everything even if something dont seem related and you will probably be surprised at what you may find as the culprit all along.like me i never would have thought that a tiny .001 cap would have caused the problems i had for so long. over the 4 years i had this silvertone i replaced so much, caps, resistors, done it all.
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