[EdHolland]

Rich,

From your schematic in post #226 (top of the page) the diagram calls 310 V on one side of R100, and 190 V on the other i.e. you should expect to see about 120 V across your resistor, close to the 116 V you see in AM. The fact you see a different voltage drop when on FM may or may not be significant - sorry, I can't help you there, but perhaps someone knows. Does the voltage differ depending where the radio is tuned on the FM range, whether it is on a station or not - that kind of thing?

Cool radio, by the way