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

    Rectifier tube?


    Posts : 227
    Join date : 2013-02-10

    Rectifier tube? Empty Rectifier tube?

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

    Can I substitute a 5U4G rectifier for the GZ34 in a VTA ST-120?
    Bob Latino
    Bob Latino

    Posts : 2862
    Join date : 2008-11-26
    Location : Massachusetts

    Rectifier tube? Empty Re: Rectifier tube?

    Post by Bob Latino on 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 ..


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