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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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    Can You Identify The Quadcaps On This PCB

    EddieGnz1
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    EddieGnz1


    Posts : 23
    Join date : 2013-10-16
    • Post n°1

    Can You Identify The Quadcaps On This PCB Empty Can You Identify The Quadcaps On This PCB

    Post by EddieGnz1 Fri Nov 29, 2013 7:12 pm

    Do you know how to identify capacitors on an ST-70?

    which capacitors on this ST-70 kit are the replacement of the Quadcap?

    PCB Photo

    here's a list of the parts in the above board;

    Parts List

    Which one replaced the 80?
    which one replaced the 40?
    which one replaced the 30?
    which one replaced the 20?

    Kind thanks,
    Eddie
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    OnlineBob Latino
    Bob Latino
    Bob Latino
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    Posts : 3274
    Join date : 2008-11-26
    Location : Massachusetts
    • Post n°2

    Can You Identify The Quadcaps On This PCB Empty Re: Can You Identify The Quadcaps On This PCB

    Post by Bob Latino Fri Nov 29, 2013 7:57 pm

    C1 and C2 together replace the 40 section
    C3 and C4 together replace the 80 section
    C5 and C6 together replace the 20 section
    C7 and C8 together replace the 30 section

    Although the first section (C1 and C2) are together 800 VDC rated (two 400 volt rated caps in series), the last three sections on that cap board are only rated at 500 VDC. The original Dynaco quad cap was rated at 525 volts - so - what that cap board from Triode Electronics (designed by Sheldon Stokes) gives you is larger capacitance than the original quad cap or the 80, 40, 30, 20 uF replacement caps at the expense of LOWER VOLTAGE ratings on the last three sections.

    Bob
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