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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


3 posters

    PAS TCLA noise problem

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    elmostro


    Posts : 4
    Join date : 2011-08-24

    PAS TCLA noise problem Empty PAS TCLA noise problem

    Post by elmostro Fri Sep 16, 2011 12:41 pm


    I recently purchased a tone control line and i'm having a noise problem with it. I get a nice buzz through the amp. I have gone through the wiring and cannot find any mistakes that I may have had. the buzz is there with the volume control turned all the way down. When I turn the volume up the buzz kind of go away but still there is less. Does anyone have any ideas?
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    GP49


    Posts : 792
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    PAS TCLA noise problem Empty Re: PAS TCLA noise problem

    Post by GP49 Fri Sep 16, 2011 1:33 pm

    I would guess something at the input, since when you turn the volume UP, you are lowering the impedance at the input, thus affecting the hum/buzz pickup.

    General rule of thumb I follow is that if it's a BUZZING, the most likely cause is a ground loop. I'd start there.
    Roy Mottram
    Roy Mottram
    Admin


    Posts : 1840
    Join date : 2008-11-30

    PAS TCLA noise problem Empty Re: PAS TCLA noise problem

    Post by Roy Mottram Fri Sep 16, 2011 2:41 pm

    most likely a bad ground, or lack of ground, or ground loop

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