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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


    Wall voltage

    Brap
    Brap

    Posts : 131
    Join date : 2013-11-28
    Age : 65
    Location : Plainfield, illinois

    Wall voltage Empty Wall voltage

    Post by Brap on Sat Dec 12, 2020 10:29 pm

    Just moved and have been monitoring the voltage going to my VTA ST70. Fluctuates between 116-125. Not sure the amp cares for the higher end. Thoughts, recommendations appreciated. Power conditioners are really $$$. Good to be back on the forum. Lost a job, moved, found a new gig and loving it. Bob’s and and my Fritz Carreras are a great combo in the new listening room.
    Dave_in_Va
    Dave_in_Va

    Posts : 384
    Join date : 2013-04-02

    Wall voltage Empty Re: Wall voltage

    Post by Dave_in_Va on Sun Dec 13, 2020 1:08 am

    I use a bucking transformer but my wall voltage stays around 123-124 so the bucker is putting out the correct voltage for my VTA ST70.

    I think with your voltage taking such a wide swing you're going to be stuck with a really expensive piece of gear (not just a plain power conditioner - you'll need something that regulates the output) or you're just going to have to use a variac, watch your wall voltage and compensate.

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    New2Tubez

    Posts : 78
    Join date : 2018-03-20
    Location : NY

    Wall voltage Empty Re: Wall voltage

    Post by New2Tubez on Sun Dec 13, 2020 1:18 am

    My wall current runs between 119 and 126v. I use the "variac" recommended by Bob and set that to 117 with a meter. Less than ideal but workable.

    Search the forum and you'll find what you need.
    peterh
    peterh

    Posts : 1479
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Wall voltage Empty Re: Wall voltage

    Post by peterh on Sun Dec 13, 2020 3:58 am

    Brap wrote:Just moved and have been monitoring the voltage going to my VTA ST70. Fluctuates between 116-125. Not sure the amp cares for the higher end. Thoughts, recommendations appreciated. Power conditioners are really $$$. Good to be back on the forum. Lost a job, moved, found a new gig and loving it. Bob’s and and my Fritz Carreras are a great combo in the new listening room.
    I don't think the amp cares. I have between 238 and 242 Volt here as my APC
    UPS tells me ( used to computers only). ( sweden has nominal 230Volt )
    If bias is adjusted when voltage is high there is no danger when voltage is
    lower.
    Brap
    Brap

    Posts : 131
    Join date : 2013-11-28
    Age : 65
    Location : Plainfield, illinois

    Wall voltage Empty wall voltage

    Post by Brap on Mon Dec 14, 2020 11:02 am

    My concern is rectifier and tube longevity.
    peterh
    peterh

    Posts : 1479
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Wall voltage Empty Re: Wall voltage

    Post by peterh on Mon Dec 14, 2020 12:13 pm

    Brap wrote:My concern is rectifier and  tube longevity.
    Keep bias on the low side then. And avoid hot starts.
    Brap
    Brap

    Posts : 131
    Join date : 2013-11-28
    Age : 65
    Location : Plainfield, illinois

    Wall voltage Empty Re: Wall voltage

    Post by Brap on Tue Dec 15, 2020 10:46 pm

    Thanks to all. Variac coming tomorrow

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