The Dynaco Tube Audio Forum

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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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    PAS3 cap question

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    stellan


    Posts : 3
    Join date : 2010-03-05

    PAS3 cap question Empty PAS3 cap question

    Post by stellan Sun Nov 11, 2012 4:46 pm

    On the board layout for the PC5 line stage there are two 3900pF caps. Does anyone know if it´s OK to use 4700pf instead or is this a critical value?
    Stellan
    Roy Mottram
    Roy Mottram
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    Posts : 1839
    Join date : 2008-11-30

    PAS3 cap question Empty Re: PAS3 cap question

    Post by Roy Mottram Tue Nov 13, 2012 4:51 pm

    that's part of the high-filter circuit, so it will affect the freq response when the switch is in the high-filter position,
    which rolls off the upper frequencies. Original Dynaco value was 4000pf. 3900pf is closest standard value.
    Or even use 3300pf and 680pf in parallel. It shouldn't make any difference in normal use without the high-filter switch.

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