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 Tubes4hifi.com products and all Dynakitparts.com products


    KT-120s in a mk3?

    Share

    cduarte

    Posts : 2
    Join date : 2010-12-13

    KT-120s in a mk3?

    Post by cduarte on Wed Jan 05, 2011 8:23 pm

    can this be done? is it advisable and are modifications required?

    Bob Latino
    Admin

    Posts : 2411
    Join date : 2008-11-26
    Location : Massachusetts

    Re: KT-120s in a mk3?

    Post by Bob Latino on Thu Jan 06, 2011 6:53 am

    Hi,

    The Tung-Sol KT120 output tubes draw more current than any KT88 or 6550 tube and the power transformers in any original Mark III will be stressed more than normal. At the very least the amp will run warmer than normal. Whether this will cause any harm to the amp, I cannot say. As for any modifications, I would say to drop the bias a little to keep the current draw on each tube a little lower.

    If you have a newer Mark III kit from Dynakitparts then I would Email Kevin at Dynakitparts for some guidance on this issue ..

    Bob

      Current date/time is Sat Dec 03, 2016 11:50 pm