Quote:
Originally Posted by miniman82
Thanks Tom, this is a series string set so technically AC is everywhere already? In any case this has vacuum rectifiers not diodes, so that’s not it. I thought the 6.3v transformer I put on the CRT filament was magnetically influencing the tube due to where I had it mounted, but the rolling remained after I moved it elsewhere.
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It's not the AC voltage that causes the problem, it's the AC current flowing through the wire that generates a circulating magnetic field around the wire. Any of the wires in the series filament string (or the AC line wiring to the switch, etc.) that pass close to an unshielded part of the CRT can cause this kind of problem. Also any of the wires in the rectifier (or voltage doubler if it has one) up to the first filter capacitor can have high AC current on them and can do a similar thing.