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    ST-70 buzz question

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    Drugolf

    Posts : 27
    Join date : 2014-12-29

    ST-70 buzz question

    Post by Drugolf on Sun Jun 04, 2017 2:30 pm

    Hey folks!
    hopefully a quick question for those of you in the know.
    I am getting a buzz coming out of the speaker, left side only, when I do not have a preamp connected. Swapped tubes etc and still left side. Only when nothing connected to RCA inputs.
    Any ideas?
    Thanks
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    peterh

    Posts : 798
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: ST-70 buzz question

    Post by peterh on Sun Jun 04, 2017 3:34 pm

    Drugolf wrote:Hey folks!
    hopefully a quick question for those of you in the know.
    I am getting a buzz coming out of the speaker, left side only, when I do not have a preamp connected.  Swapped tubes etc and still left side.  Only when nothing connected to RCA inputs.
    Any ideas?
    Thanks

    connect something .

    An unterminated open input will always pick up noise.
    You might replace stuff and move cables around to get rid of the symptom, but it's
    only a symptom during an abnormal work state.
    avatar
    Bob Latino
    Admin

    Posts : 2525
    Join date : 2008-11-26
    Location : Massachusetts

    Re: ST-70 buzz question

    Post by Bob Latino on Sun Jun 04, 2017 4:01 pm

    If you plug in two interconnects to the amp and the other two ends of the interconnects into your preamp, the noise should go away. This is perfectly normal behavior for the Dynaco amps and many other tube amps.

    Bob

    Drugolf

    Posts : 27
    Join date : 2014-12-29

    Re: ST-70 buzz question

    Post by Drugolf on Sun Jun 04, 2017 7:07 pm

    Okay, thanks. Seemed odd but it is dead quiet when everything is connected so I found it odd.

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