Hum in left channel

PolkClyde
PolkClyde Posts: 662
edited March 2011 in Basic Hookup/Wiring Questions
it's really not that bad,I have to put my ear to the left speaker to hear it,though.but,zero hum in the right channel.being an audioflile,I don't want any hum,period. I have the popular Adcom pre-amp 750 and love it,in passive mode.I don't believe that's the problem. thanks
PolkAudioClyde
Post edited by PolkClyde on
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  • lanchile
    lanchile Posts: 560
    edited March 2011
    PolkClyde wrote: »
    it's really not that bad,I have to put my ear to the left speaker to hear it,though.but,zero hum in the right channel.being an audioflile,I don't want any hum,period. I have the popular Adcom pre-amp 750 and love it,in passive mode.I don't believe that's the problem. thanks

    ok, disconnect all the input to the preamp and check for hum ( sometimes is the source).... Now check just the amp ( disconnect the preamp from the amp) and see if you still have the hum. Check the DC offset both channels.
    Make it simple...Make it better!
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  • PolkClyde
    PolkClyde Posts: 662
    edited March 2011
    lanchile wrote: »
    ok, disconnect all the input to the preamp and check for hum ( sometimes is the source).... Now check just the amp ( disconnect the preamp from the amp) and see if you still have the hum. Check the DC offset both channels.

    Thanks,Lanchile
    PolkAudioClyde
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  • lanchile
    lanchile Posts: 560
    edited March 2011
    Sure!. let us know how it goes.:wink:
    Make it simple...Make it better!
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited March 2011
    If the hum is there for all sources, you can focus on the amp/ pre-amp IC's.

    It can also be as simple as a poor IC RCA connection. If metals other than gold are involved, oxidation will build up over time. Usually breaking/ remaking the connection(s) a time or two will clean them up.
    More later,
    Tour...
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