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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    ST70 - Tube heater center tap capacitor

    Don_U
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    Don_U


    Posts : 3
    Join date : 2020-12-20
    • Post n°1

    ST70 - Tube heater center tap capacitor Empty ST70 - Tube heater center tap capacitor

    Post by Don_U Sun Mar 19, 2023 5:54 pm

    Hello:
    Question about ST70:
    What is the .02uf cap that connects to center tap used for? Is it correct that it decouples oscillation?
    Thanks,
    Don
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    Rec
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    Rec


    Posts : 71
    Join date : 2020-03-11
    • Post n°2

    ST70 - Tube heater center tap capacitor Empty Re: ST70 - Tube heater center tap capacitor

    Post by Rec Mon Mar 20, 2023 10:47 am

    As far as I can tell I think it allows the heater center tap to float at some “arbitrary” dc value Vs a more traditional voltage divider to elevate ground? How? No clue. I have however, wondered if the latter approach is beneficial in these amps. One of these days I may put a meter on it….

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