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


3 posters

    ST 70 power transformer

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    zapped1


    Posts : 4
    Join date : 2022-10-27

    ST 70 power transformer Empty ST 70 power transformer

    Post by zapped1 Fri Nov 11, 2022 5:00 pm

    Happy Friday all, this is my first post here on the forum,( I'm also a tube equipment newbie). I have been working on a ST70 and I'm going thru the wiring looking for cold solder joints or???
    I'm looking at the power transformer and the colors of the wires have faded to the point that red looks white, brown looks white ect. Is there any way to determine these colors? Could I remove the trans ,open the case to see if there's any color in there? Obviously the amp worked at some point in it's life; although I don't know it's history. Any advise is appreciated Thanks Gary
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    New2Tubez


    Posts : 147
    Join date : 2018-03-20
    Location : NY

    ST 70 power transformer Empty Re: ST 70 power transformer

    Post by New2Tubez Fri Nov 11, 2022 6:15 pm

    If it's original (not modified/messed with) you could download the manual/wiring diagram. I think it's in the stickies area of the basket on this forum. Look at what the trans. wires connect to and maybe label the wires.

    I'm just guessing. I built the VTA ST120 kit from new.
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    zapped1


    Posts : 4
    Join date : 2022-10-27

    ST 70 power transformer Empty Re: ST 70 power transformer

    Post by zapped1 Fri Nov 11, 2022 8:42 pm

    Thanks for that, I already have the build instructs and manuals
    tubes4hifi
    tubes4hifi
    Admin


    Posts : 1779
    Join date : 2008-11-30

    ST 70 power transformer Empty Re: ST 70 power transformer

    Post by tubes4hifi Sat Nov 12, 2022 7:10 pm

    same advice, look at where the leads are connected and then you'll know what's what

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    ST 70 power transformer Empty Re: ST 70 power transformer

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