I have an H-500 on my work bench. I intend to recap it, but I keep putting the project off. So far I replaced the power resistor with an aluminum wirewound resistor, and the selenium rectifier with a more modern silicone one. I powered it back on and it was still working fine. I also did the deoxit thing with the selector switches.
http://www.transoceanic.nostalgiaair.org/h-500.htm
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Technics SL-D2, Pioneer SA-7500, Mitsubishi M-A4370, Rotel RB870 Power Amplifer, NHT Model II Speakers, Grado SR60.
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