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Just to chime in here. Try use use those 500uf caps when possible in power supply. I have got a 1924 AK 20 Big Box set running off an AC supply. I used big caps to quash any AC hum, really needed since these are DC sets to avoid hum showing up in audio.
That supply needs smooth as possible dc. Smaller caps used--- as big cap technology not there yet or too costly long ago.
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1977 Zenith Chromacolor II
A Very Modern Zenith
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