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how many watt is the small resister ,in the picture it looks like a 1/2 watt one, if it is i wonder if that is contributing to the diode heating up . how much is the current draw is on that circuit ,i think the 330v supply on my zenith iv been rebuilding is about 450ma you might just need to up the small resister to 1 watt and see if the diode stays cooler . does the diode heat up fast or does it take alittle time. its looks like a neat idea does it plug into a base socket that easy to get at, if it does you could put everthing on a small breadboard and have the two prongs sticking out the end and it could be a fusible filter setup that can kwick change out.
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