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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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    Wattage of 10 ohm bias sensing resistors.

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    Viridian2


    Posts : 2
    Join date : 2023-12-09

    Wattage of 10 ohm bias sensing resistors. Empty Wattage of 10 ohm bias sensing resistors.

    Post by Viridian2 Sat Dec 09, 2023 2:21 pm

    Happy holidays to all. I am putting together a ST70, and a pair of MK3s. Can someone please suggest the correct wattage for the 10 ohm bias sensing resistors?Thanks in advance for the guidance.
    peterh
    peterh


    Posts : 1861
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Wattage of 10 ohm bias sensing resistors. Empty Re: Wattage of 10 ohm bias sensing resistors.

    Post by peterh Sat Dec 09, 2023 5:32 pm

    Viridian2 wrote:Happy holidays to all. I am putting together a ST70, and a pair of MK3s. Can someone please suggest the correct wattage for the 10 ohm bias sensing resistors?Thanks in advance for the guidance.

    1/4 w will do just fine. They have a dual function : be something to measure voltage across ( your bias setting) and "blow off" in case if flash over in a tube. This blow off will protect output transformer in case of a shorted or flash over tube.

    ( 0.5v x 50mA = 0.025w )
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    Viridian2


    Posts : 2
    Join date : 2023-12-09

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    Post by Viridian2 Sat Dec 09, 2023 5:52 pm

    Mr. H, thanks very much for the guidance. Exactly why I asked, had a feeling they had a fuse type function as well. Off to Mouser to book my order. Thanks again.

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