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radiotvnut,
The existing ballast resistor is between the rectifier and the first filter. At least, I am assuming that it is a resistor. In the photo it is the thin brown wire wound component connected to the rectifier. No it has nothing to do with the filament voltage that I can tell - that AC is dropped by the 90v motor in series with the filament.
I am on the train now but will take some more readings later on. I will also try to get a schematic drawn up but that may take a while.
It is turning out to be a much more understandable job thanks to the forum members and people like Gary Stork who have a passion for keeping these old units alive and working. Thanks again.
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06-25-2012, 03:44 PM
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