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I've swapped tubes with used ones, and no change, and none of those show a HK short on my checker(s). I made sure the band of outside foil also went toward the lowest side, not the grids. Actually the amount of hum I get now might be tolerable. I sort of think that it may have always had some hum, as the design is quite different from the usual american style setups. Such as the rectifier tubes are on one side of the chassis and the filter capacitors are on the opposite side, routing the power supply wiring right across the audio circuits. One problem is that the cartridge I used only has an output of .5 volts, and I have no idea what the output of the original one had. Having to turn up the volume higher when playing records introduces more hum. I'm thinking of maybe fitting some type of crystal cartridge in the tonearm, which will have a higher output, and that way the volume control won't have to be turned up so high. Problem is finding a cartridge that will fit.
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