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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


    My VTA Audio Transformers

    Tom Pickett
    Tom Pickett


    Posts : 203
    Join date : 2020-11-22
    Age : 58
    Location : Texas

    My VTA Audio Transformers  Empty My VTA Audio Transformers

    Post by Tom Pickett Mon Apr 26, 2021 2:39 pm

    My VTA Audio Transformers

    Look at this everyone... As with everything I do I check my components especially my audio and power transformers.

    I am absolutely stunned and  shocked how tight the tolerances are on my two audio transformers for my VTA ST 120 amp.
    The tolerances are almost identical to one another and that is very rare indeed. Love It !  My VTA Audio Transformers  1f600

    Take a look at my findings below.

    VTA ST 120 Amp Audio Transformers (All Measurements Done XL830L Digital Multimeter)

    Output Side Audio Transformer 1 / Audio Transformer 2

    Back Lead - / Red Lead +

    Orange/Black: 1.9 ohms / 1.8 ohms

    Orange/Brown: 1.9 ohms / 1.7 ohms

    Orange/Yellow: 1.8 ohms / 1.9 ohms


    Black/Orange: 1.9 ohms / 1.9 ohms

    Black/Brown: 1.9 ohms / 1.8 ohms

    Black/Yellow: 1.9 ohms / 1.9 ohms


    Brown/Orange: 1.8 ohms / 1.9 ohms

    Brown/Black: 1.8 ohms / 1.9 ohms

    Brown/Yellow : 1.8 ohms / 1.8 ohms


    Yellow/Orange: 1.8 ohms / 1.9 ohms

    Yellow/Black: 1.9 ohms / 1.9 ohms

    Yellow/Brown: 1.7  ohms / 1.9 ohms


    Input Side Audio Transformer 1 / Audio Transformer 2

    Red/Blue: 35.6 ohms / 35.7 ohms

    Red/Blue-White: 29.8 ohms / 30.7 ohms

    Red/Green: 15.9 ohms / 16.0 ohms

    Red/Green-White: 13.7 ohms 13.9 ohms


    Blue/Red: 35.7 ohms / 35.8 ohms

    Blue/Blue-White: 63.8 ohms / 64.2 ohms

    Blue/Green: 21.2 ohms / 21.3 ohms

    Blue/Green-White: 47.9 ohms / 48.1 ohms


    Green/Red: 15.9 ohms / 16.2 ohms

    Green/Blue: 21.2 ohms / 21.3 ohms

    Green/Blue-White: 43.8 ohms / 44.5 ohms

    Green/Green-White: 28.0 ohms / 28.4 ohms


    Blue-White/Red: 29.5 ohms / 30.0 ohms

    Blue-White/Blue: 63.6 ohms / 64.3 ohms

    Blue-White/Green: 44.1 ohms / 44.5 ohms

    Blue-White/Green-White: 17.4 ohms / 17.7 ohms


    Green-White/Red: 13.6 ohms / 13.9 ohms

    Green-White/Blue: 47.9 ohms / 48.2 ohms

    Green-White/Green: 28.0 ohms / 28.4 ohms

    Green-White/Blue-White: 17.3 ohms / 17.7 ohms

      Current date/time is Thu Mar 28, 2024 3:04 pm