The Dynaco Tube Audio Forum

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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


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    ST-70 buzz question

    Drugolf
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    Drugolf


    Posts : 29
    Join date : 2014-12-29
    • Post n°1

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    Post by Drugolf 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
    peterh
    peterh


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    Join date : 2012-12-25
    Location : gothenburg, sweden
    • Post n°2

    ST-70 buzz question Empty Re: ST-70 buzz question

    Post by peterh 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.
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    Bob Latino
    Bob Latino
    Bob Latino
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    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°3

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    Post by Bob Latino 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
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    Drugolf
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    Drugolf


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    Join date : 2014-12-29
    • Post n°4

    ST-70 buzz question Empty Re: ST-70 buzz question

    Post by Drugolf 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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