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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    Connection application

    jonny6336
    jonny6336
    jonny6336


    Posts : 29
    Join date : 2018-01-31
    Age : 46
    Location : Italy
    • Post n°1

    Connection application Empty Connection application

    Post by jonny6336 Wed Feb 24, 2021 8:16 am

    Hi guys
    Question, wanting to make an even cleaner wiring and avoid inserting a wire towards the ground node, could the 0.02 capacitors refer to ground be connected like this?
    since the frame is all grounded?
    Connection application St-70-10
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    Bob Latino
    Bob Latino
    Bob Latino
    Admin


    Posts : 3276
    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°2

    Connection application Empty Re: Connection application

    Post by Bob Latino Thu Feb 25, 2021 8:11 pm

    Maybe you could and then again maybe it would cause a ground loop and some extra hum/buzz ? BUT > Consider that Dynaco grounded the original Dynaco ST-70 this way with the two 6.3 volt AC filament lines center taps star grounded through the two .022 uF capacitors. The noise level of the original Dynaco ST-70 amp and the VTA ST-70 amp are very low. Both are in the -90 dB range which is lower than normal for a tube amp.

    Personally, I don't think anything is to be gained from local grounding those two center taps. It could make no difference OR it could increase the residual noise level of the amp ?

    Bob
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    jonny6336
    jonny6336
    jonny6336


    Posts : 29
    Join date : 2018-01-31
    Age : 46
    Location : Italy
    • Post n°3

    Connection application Empty Re: Connection application

    Post by jonny6336 Fri Feb 26, 2021 1:57 am

    Thanks Bob for the clarification, I am in the construction phase of a VTA ST 120 and studying the assembly phases I was wondering about this point, however I am curious to try. For Italy have you reactivated shipments for the purchase of the pcb?

    Giovanni
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    • Post n°4

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