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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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    Pentode/triode switch position?

    StevieRay
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    StevieRay


    Posts : 67
    Join date : 2009-01-09
    Age : 62
    Location : Central VA
    • Post n°1

    Pentode/triode switch position? Empty Pentode/triode switch position?

    Post by StevieRay Fri Nov 27, 2020 8:22 pm

    An entirely DUMB question, since I’ve owned the VTA ST-120 for almost 2 years now....

    I’ve never moved it much — which direction on the switches are triode vs pentode?  Which way is TOWARDS the transformers?

    ‘Sorry, can’t locate my manual just now.....
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    Bob Latino
    Bob Latino
    Bob Latino
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    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°2

    Pentode/triode switch position? Empty Re: Pentode/triode switch position?

    Post by Bob Latino Fri Nov 27, 2020 8:51 pm

    StevieRay wrote:An entirely DUMB question, since I’ve owned the VTA ST-120 for almost 2 years now....

    I’ve never moved it much — which direction on the switches are triode vs pentode?  Which way is TOWARDS the transformers?

    ‘Sorry, can’t locate my manual just now.....

    Pentode ultralinear mode is when the switch faces the power transformer. This is the normal mode of operation of the amp. Triode mode is when the switch faces the driver board.

    Bob
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    StevieRay
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    StevieRay


    Posts : 67
    Join date : 2009-01-09
    Age : 62
    Location : Central VA
    • Post n°3

    Pentode/triode switch position? Empty Re: Pentode/triode switch position?

    Post by StevieRay Fri Nov 27, 2020 9:03 pm

    Thanks Bob; I think triode mode will be perfect for the Nick Drake binge I’m about to go on!

    You’re the best — I’m sure any number of readers could have answered, but from the seller, on a holiday weekend, is priceless!  I’m certain the big boy companies don’t have service like this!

    Cheers and happy holidays!
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    StevieRay
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    StevieRay


    Posts : 67
    Join date : 2009-01-09
    Age : 62
    Location : Central VA
    • Post n°4

    Pentode/triode switch position? Empty Re: Pentode/triode switch position?

    Post by StevieRay Fri Nov 27, 2020 9:15 pm

    Oops; now I realize that I’ve been biasing in the wrong position....
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    • Post n°5

    Pentode/triode switch position? Empty Re: Pentode/triode switch position?

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