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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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    One last MK3 Diode mod Bias question

    bubbasweet
    bubbasweet
    bubbasweet


    Posts : 95
    Join date : 2016-03-14
    • Post n°1

    One last MK3 Diode mod Bias question Empty One last MK3 Diode mod Bias question

    Post by bubbasweet Thu Jul 28, 2016 6:16 pm

    I did the Bias Diode Mod and the Caps. I did not change the 1K resistor and everything seems to work fine. If I can reach the 1.56V bias fine and my pots are not at the end of either side. is there any reason why I can't leave the 1K or should I still sub out for the 4.7K? Is the 4.7K only to raise the voltage so the bias can be achieved or is there another reason I need it.... THX

    I think my voltages are -55 and -60 on the other.
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    GP49
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    GP49


    Posts : 792
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    • Post n°2

    One last MK3 Diode mod Bias question Empty Re: One last MK3 Diode mod Bias question

    Post by GP49 Thu Jul 28, 2016 8:13 pm

    If things are working out as you say, don't change.
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    bubbasweet
    bubbasweet
    bubbasweet


    Posts : 95
    Join date : 2016-03-14
    • Post n°3

    One last MK3 Diode mod Bias question Empty Re: One last MK3 Diode mod Bias question

    Post by bubbasweet Fri Jul 29, 2016 3:27 pm

    OK leaving it.. Biasing fine and plenty of wiper room.. THX
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    • Post n°4

    One last MK3 Diode mod Bias question Empty Re: One last MK3 Diode mod Bias question

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