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Let me throw this out. I have two of these guys and they are quite different "under the hood". I think there is an early and a later model. One may have DC on the filament and the other may have AC? I am going from memory here since one of mine is in FL and the other one is in MD.
If yours is supposed to put out DC, there "May" be a problem with that circuitry. An old capacitor or bad diode. I don't think they used selenium rectifiers.
Hopefully, this will trigger some more information for you...
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