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I haven't done a 500, but did a 600, which is very similar. I did a lot of reading before tackling that one and I just very carefully marked off with a highlighter every change of component I made on a copy of the schematic. I let it sit for a day or two and then traced everything out again to be sure. The filaments are in series in these sets and I read that the voltage from the start of the series to the end should be within a certain range, seems like it was eight point something. I hooked my voltmeter to those points and plugged the radio into my variac and sneaked the voltage up. When the radio started playing I was happy to see my filament voltage was right on. The set I restored was for a friend. It played before restoration but I changed the caps and rectifier to keep it going right. It was beautiful cosmetically as it had sat in a closet for many years.
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Reece
Perfection is hard to reach with a screwdriver.
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