The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all products and all products

    Balancing KT-88s in a VTA-70i



    Posts : 1
    Join date : 2013-12-30

    Balancing KT-88s in a VTA-70i

    Post by Supra1988T on Mon Dec 30, 2013 3:55 am

    Hi, I have a VTA-70i and I received a matched quad of KT-88s for christmas but I cannot get them balanced. With the pots all the way down both "low" lights are still completely unlit. I have read that ST-70s running KT-88s need the R39 resistor swapped from 10k to 7.5k or 5k but I don't know how this translates to the VTA-70i and I can't find much info on this amp. Does anyone know what needs to be done to get the KT-88s balanced and where to find a schematic?


      Current date/time is Fri May 25, 2018 8:07 pm