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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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    .45v bias ok for KT120 tubes in ST-120 amp?

    ChetJettison
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    ChetJettison


    Posts : 35
    Join date : 2021-12-03
    • Post n°1

    .45v bias ok for KT120 tubes in ST-120 amp? Empty .45v bias ok for KT120 tubes in ST-120 amp?

    Post by ChetJettison Sat Mar 09, 2024 11:35 pm

    I’ve got the auto bias board, which keeps all my tubes biased to .45v. Currently running KT88s, sometimes 6550s. But I have a set of KT120 tubes I’ve never used.
    As I understand it, I should be fine to drop them in, and they’ll play nice at .45v. Is that right?
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    OnlineBob Latino
    Bob Latino
    Bob Latino
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    Posts : 3276
    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°2

    .45v bias ok for KT120 tubes in ST-120 amp? Empty Re: .45v bias ok for KT120 tubes in ST-120 amp?

    Post by Bob Latino Sun Mar 10, 2024 10:00 am

    ChetJettison wrote:I’ve got the auto bias board, which keeps all my tubes biased to .45v. Currently running KT88s, sometimes 6550s. But I have a set of KT120 tubes I’ve never used.
    As I understand it, I should be fine to drop them in, and they’ll play nice at .45v. Is that right?

    Yes - In the VTA ST-120 a bias point within the range of .45v to .50v for each output tube is fine ..

    Bob
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