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 products

    110v or 220v power output.


    Posts : 34
    Join date : 2009-05-12
    Age : 56
    Location : athens

    110v or 220v power output. Empty 110v or 220v power output.

    Post by kost on Mon Mar 07, 2011 5:20 pm

    Hi to all

    I am about to change the power transformers from both VTA ST 70 and
    I live in Greece where we have 220v power and i wonder what is the best solution,
    a 110 v with a step down transformer that i have and it is of a very good quality or a 220v?
    Some people say that its better to have a step down trans,it makes a kind of filtration in power.
    What do you think?

    Bob Latino
    Bob Latino

    Posts : 2874
    Join date : 2008-11-26
    Location : Massachusetts

    110v or 220v power output. Empty Re: 110v or 220v power output.

    Post by Bob Latino on Mon Mar 07, 2011 5:35 pm

    Hi Kost,

    I think it is better to have a 120/220(240) dual primary transformer on an ST-70 rather than run the amp off a 240 to 120 down-drop outboard transformer. Set up like that you can run it at 220 volts but the amp may be easily rewired for 120 volts. If you ever decide to sell the amp it would probably be worth more with a dual primary power transformer. The only downside is that the dual primary PA-521 power transformer for the ST-70 will cost $30 - $40 USD more than the 120 volt version.

    As for your ST-35, Dynakitparts makes 240 volt transformer for the ST-35 - the PB-028-1.


      Current date/time is Thu Feb 27, 2020 11:06 pm