The Dynaco Tube Audio Forum

Would you like to react to this message? Create an account in a few clicks or log in to continue.
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

    Rectifier tube?

    Maintarget
    Maintarget
    Maintarget


    Posts : 227
    Join date : 2013-02-10
    • Post n°1

    Rectifier tube? Empty Rectifier tube?

    Post by Maintarget Sat Dec 07, 2013 3:58 pm

    Can I substitute a 5U4G rectifier for the GZ34 in a VTA ST-120?
    • Back to top
    Bob Latino
    Bob Latino
    Bob Latino
    Admin


    Posts : 3276
    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°2

    Rectifier tube? Empty Re: Rectifier tube?

    Post by Bob Latino Sat Dec 07, 2013 5:47 pm

    Yes - you can use a 5U4 rectifier in the VTA ST-120 BUT the B+ voltage of the amp will drop below 475 volts somewhere and ...

    1. The amp will bias at a different point
    2. You will lose some overall power ... maybe 5 watts - BUT - unless you play the amp loudly, you may not notice any difference in the amp's power ..

    Bob
    • Back to top
      Current date/time is Mon Nov 25, 2024 10:17 am