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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


    power switch noise

    j beede
    j beede

    Posts : 475
    Join date : 2011-02-07
    Location : California

    power switch noise Empty power switch noise

    Post by j beede Fri Feb 18, 2011 11:28 pm

    Anyone have any luck reducing power switch turn-off pops or snaps in a Mark2/3/4 or ST-70? My Mark IIIs send a nasty "snap" when I power them down. What works?
    ...j
    Bob Latino
    Bob Latino
    Admin

    Posts : 3048
    Join date : 2008-11-26
    Location : Massachusetts

    power switch noise Empty Re: power switch noise

    Post by Bob Latino Sat Feb 19, 2011 7:44 am

    Hi,

    Try placing a .02 uF capacitor @ 200 volts or higher across the switch terminals. Usually that will stop the noise.

    Bob
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    stevebro

    Posts : 3
    Join date : 2013-06-25

    power switch noise Empty Capacitor values

    Post by stevebro Fri Jun 25, 2021 8:10 am

    Hi Bob,
    You mentioned that you could use a higher value, sorry for my ignorance but what may they be?

    Regards

    Bob Latino
    Bob Latino
    Admin

    Posts : 3048
    Join date : 2008-11-26
    Location : Massachusetts

    power switch noise Empty Re: power switch noise

    Post by Bob Latino Fri Jun 25, 2021 8:19 am

    stevebro wrote:Hi Bob,
    You mentioned that you could use a higher value, sorry for my ignorance but what may they be?

    Regards


    You could probably use a .10 uF cap also. Just make sure that that cap is rated at 200 volts or higher ..

    Bob
    avatar
    stevebro

    Posts : 3
    Join date : 2013-06-25

    power switch noise Empty Re: power switch noise

    Post by stevebro Fri Jun 25, 2021 8:29 am

    Ok thanks, cheers Bob for your speedy reply.

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    power switch noise Empty Re: power switch noise

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