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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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    Bypass PS on MK4

    Pooch
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    Pooch


    Posts : 55
    Join date : 2009-12-01
    Age : 74
    Location : Wa
    • Post n°1

    Bypass PS on MK4 Empty Bypass PS on MK4

    Post by Pooch Thu Dec 24, 2009 5:45 pm

    Happy Holidays, Bob!
    From your ST-70 reply below, would an MK4 with 80,40,30,20 PS cap benefit from bypassing, too? These amps have the VTA boards. Where's the best place to add these bypass caps?
    Also, whats the best way to wire the PS cap, the same as stock, 80 to the choke, 40 and 30 soldered together and to B+?
    Thanks,
    Gordy
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    Bob Latino
    Bob Latino
    Bob Latino
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    Posts : 3274
    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°2

    Bypass PS on MK4 Empty Re: Bypass PS on MK4

    Post by Bob Latino Fri Dec 25, 2009 5:06 pm

    Pooch wrote:Happy Holidays, Bob!
    From your ST-70 reply below, would an MK4 with 80,40,30,20 PS cap benefit from bypassing, too? These amps have the VTA boards. Where's the best place to add these bypass caps?
    Also, whats the best way to wire the PS cap, the same as stock, 80 to the choke, 40 and 30 soldered together and to B+?
    Thanks,
    Gordy

    Hi Gordy,

    The bypass capacitors are really only useful if you add a large capacitors (100 uF or higher) to the quad cap. If you do add a large capacitor, add it to the 80 section which powers the output transformer on your Mark 4. The larger the capacitor you add - the more the need of bypass capacitors. If you do add a bypass capacitor or bank of bypass capacitors add them to either the 80 section or the 20 section which are wired together with a jumper when you use the VTA driver board on a Mark 4.

    If you just use the 80, 40, 30, 20 cap as it is without any additional capacitance then you don't need any bypass capacitors.

    Bob
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    Pooch
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    Pooch


    Posts : 55
    Join date : 2009-12-01
    Age : 74
    Location : Wa
    • Post n°3

    Bypass PS on MK4 Empty Re: Bypass PS on MK4

    Post by Pooch Sat Dec 26, 2009 7:28 pm

    Thanks, Bob.I think I'll just leave it with the 80uf can cap. Lots of bass already.
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    • Post n°4

    Bypass PS on MK4 Empty Re: Bypass PS on MK4

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