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Thanks - must've had it backwards, it's working now with the diode. Voltages are about right, no hum, so the caps must still be OK. FM was still quiet, but I replaced some out-of-spec resistors and it's much better.
FM reception seems pretty good now and the sound is clear, but the FM volume is still lower than I think it ought to be - cranked all the way up it's at a comfortable listening level, but I know there should be more headroom. No problems with the AM side.
There are still a couple of resistors out of spec, so I'll replace them tomorrow if I can find replacements around here. If that doesn't do it, would a weak tube cause low volume? Something else I should look at?
Thanks again!
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