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Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all products and all products

    Dynakit ST-70 Covers



    Posts : 148
    Join date : 2010-08-30

    Re: Dynakit ST-70 Covers

    Post by j4570 on Sat Dec 19, 2015 12:09 pm


    You have a good wife. Mine would get violent if it was just one sister

    Posts : 959
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: Dynakit ST-70 Covers

    Post by peterh on Sat Dec 19, 2015 2:28 pm

    DynakitParts wrote:In review of everyone's reply (Thank you)...

    It appears that Peter's problem may in fact be due to the 50hz operation of the power transformer....Although, I have never had one complaint from our International customers, I think the choice of the word violently was a bit over the top. Violently would be my wife's reaction to finding me in bed with her (2) younger sisters...

    Merry Christmas to all...


    Seems like a good explanation of the mechenical hum that disturbs me.
    In fact, in 1970 i built and used a pair of MkIII, but had to sell them ( and replace with
    a ARD-76 that was dead silent )
    The MkIII vibrated not only with their covers, but even more due to the magnetic
    properties of the chassies they were made of.
    Maybe we should convert to DC ( 380V DC should be quite good to run stereos on :-)

    Happy X-mas and keep up the Good Work !

    Posts : 146
    Join date : 2012-04-11
    Location : Granada (España)

    Re: Dynakit ST-70 Covers

    Post by Pillo69 on Fri Dec 25, 2015 2:56 pm

    Peterh, I rewind my original transformer (PA-060) to a friend in Barcelona (Spain).
    - Primary 240V / 50Hz..
    - Secondary 5,3Amp filaments.
    - Secondary 3Amp rectifier valve.
    - Electrostatic screen between primary and secondary.

    Performance is very good, and quite cold.

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    Re: Dynakit ST-70 Covers

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