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


2 posters

    st-70 Telefunken driver tubes

    Brap
    Brap
    Brap


    Posts : 231
    Join date : 2013-11-28
    Age : 68
    Location : Plainfield, illinois
    • Post n°1

    st-70 Telefunken driver tubes Empty st-70 Telefunken driver tubes

    Post by Brap Mon Nov 21, 2022 6:37 pm

    Anyone have experience with black diamond ECC82's as drivers in their VTA ST-70?
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    peterh
    peterh
    peterh


    Posts : 1833
    Join date : 2012-12-25
    Location : gothenburg, sweden
    • Post n°2

    st-70 Telefunken driver tubes Empty Re: st-70 Telefunken driver tubes

    Post by peterh Tue Nov 22, 2022 2:39 am

    Brap wrote:Anyone have experience with black diamond ECC82's as drivers in their VTA ST-70?
    Yes, i have used JJ ECC82 most of the time. ( At start i used NOS from bob but one developed
    hum thus i replaced them )
    At present the JJ ECC82 have been powered app 4000h

    ( Telefunken black diamond is relabeled JJ )

    /PS
    Now i have measured them, and emission seems to have been reduced to app half ( i never
    measured them at install) Thus 4000h seems to be acceptable lifetime.
    Now i have replaced with redtop ECC82 ( balanced )
    Sound however seems not affected at a first listening.
    /DS
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