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 Dynakitparts.com products


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    polarflux
    polarflux


    Posts : 49
    Join date : 2010-02-12
    Location : Alaska

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    Post by polarflux Fri Feb 26, 2010 5:49 pm

    Is it possible to use 12AT7s instead of 12AU7s in the phase splitter positions on the low gain VTA board? Would there be any sonic advantages doing this or could this fry the board since the board is optimized for lower gain tubes? Just wondering.
    Bob Latino
    Bob Latino
    Admin


    Posts : 3276
    Join date : 2008-11-26
    Location : Massachusetts

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    Post by Bob Latino Sat Feb 27, 2010 9:22 am

    polarflux wrote:Is it possible to use 12AT7s instead of 12AU7s in the phase splitter positions on the low gain VTA board? Would there be any sonic advantages doing this or could this fry the board since the board is optimized for lower gain tubes? Just wondering.

    Hi,

    You won't fry the board but those parts are optimized for the 12AU7 tube.. In the two side phase splitter/phase inverter positions, changing from the 12AU7 to the 12AT7 probably won't make much difference in the sound. If, however, you swap out the center 12AU7 for a 12AT7 the gain of the amp will go up slightly.

    Bob

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