The Dynaco Tube Audio Forum

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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

    Driver Board Tubes...


    Posts : 3
    Join date : 2012-02-06

    Driver Board Tubes... Empty Driver Board Tubes...

    Post by BillyB on Wed Feb 08, 2012 7:17 pm

    How important are the tubes on the VTA driver board to sound on the St-70??

    I have heard from a few people it makes sense to put a quality NOS tube in the center position??

    Is this good advice??

    Why only the center??

    Posts : 29
    Join date : 2009-05-06

    Driver Board Tubes... Empty Re: Driver Board Tubes...

    Post by burnedfingers on Tue Feb 14, 2012 8:17 am

    Having owned the board before I can make the comment that different tubes do sound different in the driver board. The JJ's seem to have more high end in my opinion. Some of the NOS tubes have a nice laid back sound. Buy some tubes and experiment a little. Smile

    Some circuit designs you can tell a difference rolling the input/VA tube and some the phase splitter tube and some you can hear difference rolling both tubes.

    My current favorite designs use either a 5693 and 5691 per channel or a quad of 6SL7/5691's. I can hear difference rolling either the 6SJ7/5693 or the 6SL7/5691 on one board or rolling both sets on the other board. I feel that with a good stiff power supply the differences come to play. Also speakers play an important part in your system. I can hear more with my Klipsch Cornwall clones than I can with my Altec model 9's.

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