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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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    ST-70 chassis ground

    bootstrapjesse
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    bootstrapjesse


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    Join date : 2022-07-17
    Location : Fort Worth, TX
    • Post n°1

    ST-70 chassis ground Empty ST-70 chassis ground

    Post by bootstrapjesse Fri Sep 02, 2022 5:10 pm

    Greetings. I have an ST-70 chassis that is power coated. I was wondering if there was any other places that I need to ground components directly to the chassis other than the main ground stud, and the two bias resistors. I guess I'll just need to grind off the powder coat with a Dremel/wire wheel.

    Thanks in advance for the info. --J
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    Bob Latino
    Bob Latino
    Bob Latino
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    • Post n°2

    ST-70 chassis ground Empty Re: ST-70 chassis ground

    Post by Bob Latino Fri Sep 02, 2022 5:47 pm

    bootstrapjesse wrote:Greetings. I have an ST-70 chassis that is power coated. I was wondering if there was any other places that I need to ground components directly to the chassis other than the main ground stud, and the two bias resistors. I guess I'll just need to grind off the powder coat with a Dremel/wire wheel.

    Thanks in advance for the info.  --J

    Yes - Just grind off the powder coating at the places on the inside of the chassis where you have to ground certain components.

    Bob
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    bootstrapjesse
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    bootstrapjesse


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    • Post n°3

    ST-70 chassis ground Empty Re: ST-70 chassis ground

    Post by bootstrapjesse Fri Sep 02, 2022 8:25 pm

    Bob Latino wrote:
    bootstrapjesse wrote:Greetings. I have an ST-70 chassis that is power coated. I was wondering if there was any other places that I need to ground components directly to the chassis other than the main ground stud, and the two bias resistors. I guess I'll just need to grind off the powder coat with a Dremel/wire wheel.

    Thanks in advance for the info.  --J

    Yes - Just grind off the powder coating at the places on the inside of the chassis where you have to ground certain components.

    Bob

    Hi Mr Bob. Thanks for the reply. My main question was if any other components needed to be directly grounded to the chassis other than the main ground stud, and the two bias resistors.  Thanks again --Jesse
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    Bob Latino
    Bob Latino
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    • Post n°4

    ST-70 chassis ground Empty Re: ST-70 chassis ground

    Post by Bob Latino Fri Sep 02, 2022 9:36 pm

    On a STOCK Dynaco ST-70 just the two bias resistor grounds and the main ground point next to the quad cap need to be grounded directly to the chassis. On the original Dynaco ST-70 sockets V2 and V7 were grounded to the chassis. When you install socket V2 and V7 use a meter to make sure that these two sockets are properly grounded to the chassis. You should remove some of the powder coating on the bottom of the chassis where V2 and V7 connect to the chassis so that the metal of the socket connects to the chassis. See stock Dynaco ST-70 wiring pictorial below.

    Bob

    ST-70 chassis ground ST-70-pictorial-with-stock-driver-board
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    bootstrapjesse
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    bootstrapjesse


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    • Post n°5

    ST-70 chassis ground Empty Re: ST-70 chassis ground

    Post by bootstrapjesse Sun Sep 04, 2022 4:23 pm

    Bob Latino wrote:On a STOCK Dynaco ST-70 just the two bias resistor grounds and the main ground point next to the quad cap need to be grounded directly to the chassis. On the original Dynaco ST-70 sockets V2 and V7 were grounded to the chassis. When you install socket V2 and V7 use a meter to make sure that these two sockets are properly grounded to the chassis. You should remove some of the powder coating on the bottom of the chassis where V2 and V7 connect to the chassis so that the metal of the socket connects to the chassis. See stock Dynaco ST-70 wiring pictorial below.

    Bob

    ST-70 chassis ground ST-70-pictorial-with-stock-driver-board

    Thanks again Mr Bob. I really appreciate what you do. --Jesse
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    • Post n°6

    ST-70 chassis ground Empty Re: ST-70 chassis ground

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