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I have three Zenith Super Interludes, but they're all H845's (which seem to be the same except for adding dial lights and a darker colored dial background to make the numbers easier to read). All three are excellent performing sets, very dependable, and sound fantastic.
On all three of mine I replaced the selenium rectifiers with a single diode and added a resistor to drop the voltage back down to normal. Simple and easy, and there is no hum whatsoever.
The only one of my three that acts up some is the one I use the most at the office. It seems to have an AFC issue, and has to be re-tuned quite often in FM. Once it's on for a few hours, it seems to be better.
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