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

    4 ohm speaker

    rfbro
    rfbro


    Posts : 27
    Join date : 2014-12-28
    Age : 68
    Location : Vancouver WA

    4 ohm speaker  Empty 4 ohm speaker

    Post by rfbro Sun May 17, 2015 2:18 pm

    if it was possible to run 4 ohm speakers with a St 120 amplifier I believe there is a slight modification I need to do if anybody could help me with that thank you
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    Guest
    Guest


    4 ohm speaker  Empty Re: 4 ohm speaker

    Post by Guest Sun May 17, 2015 2:55 pm

    the ST120 output transformers have 4,8, & 16 OHM output tappings.
    So all you need to do is to swap the existing 8OHM tapping with the 4OHM tapping.
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    Dale Stevens


    Posts : 201
    Join date : 2014-07-06
    Age : 74
    Location : Loris, SC

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    Post by Dale Stevens Sun May 17, 2015 4:20 pm

    Those leads in the ST120 output xfrmrs are orange for 8ohms or brown for 4ohms. You should find that brown lead curled and just loose in the chasis. If you don't have a manual for that VTA then let some of us know and we'll share. Not certain if it is here online. Dale
    Bob Latino
    Bob Latino
    Admin


    Posts : 3260
    Join date : 2008-11-26
    Location : Massachusetts

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    Post by Bob Latino Sun May 17, 2015 4:35 pm

    rfbro wrote:if it was possible to run 4 ohm speakers with a St 120 amplifier I believe there is a slight modification I need to do if anybody could help me with that thank you

    Hi Robert,

    Dale has given you the correct procedure to switch your amp from 8 ohm speakers to 4 ohm speakers. Just make sure that you tape over the orange (8 ohm) lead if you do the switch. You don't want the bare metal on that lead to short to the chassis..

    Bob

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