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mcintosh mc30 hum

  1. angelaudio

    Delayed Hum on MC30

    One of my MC30’s has started to produce a high pitched hum that starts about 5 or so seconds after being plugged in. It starts off loud and then slowly decreases in volume until it levels off. I’ve ruled out the preamp as an issue and have switched the tubes from one MC30 to the other. This MC30...
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