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heaters

  1. MartyGee666

    Directly heated rectifiers

    Heyo, I'm working with 5U4 rectifier tube, and I'm getting close to 100v AC on the rectifier heaters. With no tubes I'm getting 3.5v on the power and pre-amp tubes, but the rectifier, is way out of spec from the 5v I believe I should be getting. Is there something I'm missing, it being a...
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