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SX-750 Hum?

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    SX-750 Hum?

    Hi! First post!

    I have a very old (1976) receiver: a Pioneer SX-750. It seems to be in fine shape, except for one thing. It has what sounds to be 120 cycle hum, even though _nothing is plugged in_. It's in both channels, and you can hear it from the headphone jack just listening to AM or FM radio (and also if you set it to the inputs, even with nothing plugged in). As mentioned, it sounds like 120 cycle noise, but it also doesn't increase with volume (or attenuate either). I don't get it from either of the cassette deck out plugs.

    Any thoughts?! I'm desperate!

    -- Ned Ruggeri

    #2
    Re: SX-750 Hum?

    Bad caps in the power supply.

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