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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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peterh
carcy
6 posters

    220V to 110V for a PAS-3 or SCA35 Dynaco

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    carcy


    Posts : 20
    Join date : 2023-01-20

    220V to 110V for a PAS-3 or SCA35 Dynaco Empty 220V to 110V for a PAS-3 or SCA35 Dynaco

    Post by carcy Sat Feb 11, 2023 5:20 am

    Hello guys !
    I'm a french citizen and I have at home a dynaco st-70 amp (220V), a pat4 dynaco (220V), but a pas3 in 110V and I recently bought a dynaco SCA35 in 110V too.
    Then, I do not want to change the transformers of these machines and I just wanted to make them work in 220V frome France...
    I watched yesterday a video on youtube where a guy created a 220V to 110V with 2 big caps and resistors according this schematic :
    220V to 110V for a PAS-3 or SCA35 Dynaco Alim10
    Then I know you are the best in electronics and old tube (pre)amps !!  
    What do you think about that ? do you think it would be possible in my case mountig these caps/resistors on a strip lug ?
    Thanks for your answer my friends !!
    Have a nice week end !
    JL

    (youtube link of the 220V to 110V converter : https://www.youtube.com/watch?v=MEA7oXJlDvY&t=298s)
    peterh
    peterh


    Posts : 1823
    Join date : 2012-12-25
    Location : gothenburg, sweden

    220V to 110V for a PAS-3 or SCA35 Dynaco Empty Re: 220V to 110V for a PAS-3 or SCA35 Dynaco

    Post by peterh Sat Feb 11, 2023 5:37 am

    carcy wrote:Hello guys !
    I'm a french citizen and I have at home a dynaco st-70 amp (220V), a pat4 dynaco (220V), but a pas3 in 110V and I recently bought a dynaco SCA35 in 110V too.
    Then, I do not want to change the transformers of these machines and I just wanted to make them work in 220V frome France...
    I watched yesterday a video on youtube where a guy created a 220V to 110V with 2 big caps and resistors according this schematic :
    220V to 110V for a PAS-3 or SCA35 Dynaco Alim10
    Then I know you are the best in electronics and old tube (pre)amps !!  
    What do you think about that ? do you think it would be possible in my case mountig these caps/resistors on a strip lug ?
    Thanks for your answer my friends !!
    Have a nice week end !
    JL

    (youtube link of the 220V to 110V converter : https://www.youtube.com/watch?v=MEA7oXJlDvY&t=298s)

    No, this wont work and will not be reliable.

    New transformer for PAS3 230 Volt ( PA522 replacement) are available from sweden.
    New trabsformer for SCA35 dynakitparts

    The alternative is to buy a step-down transformer locally, the same transformer may be used for
    several units provided it's power capacity is enough.

    Tubes4ever and fredeb like this post

    Roy Mottram
    Roy Mottram
    Admin


    Posts : 1840
    Join date : 2008-11-30

    220V to 110V for a PAS-3 or SCA35 Dynaco Empty Re: 220V to 110V for a PAS-3 or SCA35 Dynaco

    Post by Roy Mottram Wed Feb 15, 2023 3:37 pm

    a step-down transformer would be best and could be used to power most things that run on 115-125vac

    fredeb likes this post

    Buck_R0gers
    Buck_R0gers


    Posts : 12
    Join date : 2018-01-14
    Location : Midwest USA

    220V to 110V for a PAS-3 or SCA35 Dynaco Empty Re: 220V to 110V for a PAS-3 or SCA35 Dynaco

    Post by Buck_R0gers Fri Feb 24, 2023 12:18 am

    Do NOT do this.

    Transformers are used for very good and safe reasons.

    A "Step Down" transformer is easy and safe to use at a very reasonable price.

    The Dynaco ST35 is a wonderful amp, Treat it well and it will make you happy for many years.

    Buck
    Hauge
    Hauge


    Posts : 4
    Join date : 2010-07-05
    Age : 56
    Location : Denmark

    220V to 110V for a PAS-3 or SCA35 Dynaco Empty Re: 220V to 110V for a PAS-3 or SCA35 Dynaco

    Post by Hauge Fri Feb 24, 2023 2:34 am

    As others have already said, You should use, either a step down, or auto transformer.
    While doable in theory. It definitely won't be safe, neither for the gear, or You!

    This might be a idea?
    billinrio
    billinrio


    Posts : 107
    Join date : 2018-01-03

    220V to 110V for a PAS-3 or SCA35 Dynaco Empty Re: 220V to 110V for a PAS-3 or SCA35 Dynaco

    Post by billinrio Fri Feb 24, 2023 10:51 am

    It's easy and not expensive to find and purchase a correct voltage step-down transformer in France. I've used mine for years in Paris without any problems. Your PAS3 and SCA35 won't be bothered about the French 50 cps.

    Sponsored content


    220V to 110V for a PAS-3 or SCA35 Dynaco Empty Re: 220V to 110V for a PAS-3 or SCA35 Dynaco

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