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

    need advice

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    Mazen0822


    Posts : 1
    Join date : 2022-08-20

    need advice Empty need advice

    Post by Mazen0822 Tue Jan 10, 2023 1:50 am

    hello all, been reading the forum for a while but never posted before. so excuse my ignorance as im a newbie to this.

    there's a local guy here selling a st70 that he was building but now needs to sell. it needs the power and both output transformers replaced. he has them but has not wired them in so that would be on me. however I just want to confirm that these are the correct units since its a brand I've never heard of before.

    https://edcorusa.com/products/xpwr052-400v400-385-375-365-0-400ma?_pos=1&_sid=e9d3422c8&_ss=r

    https://edcorusa.com/collections/tube-amplifier-push-pull-output-transformer/products/cxpp60-4-2k-60w-4-2k-ohms-push-pull-tube-output-transformer?variant=41513497362619

    any help would be greatly appreciated
    peterh
    peterh


    Posts : 1718
    Join date : 2012-12-25
    Location : gothenburg, sweden

    need advice Empty Re: need advice

    Post by peterh Tue Jan 10, 2023 4:11 am

    Mazen0822 wrote:hello all, been reading the forum for a while but never posted before. so excuse my ignorance as im a newbie to this.

    there's a local guy here selling a st70 that he was building but now needs to sell. it needs the power and both output transformers replaced. he has them but has not wired them in so that would be on me. however I just want to confirm that these are the correct units since its a brand I've never heard of before.

    https://edcorusa.com/products/xpwr052-400v400-385-375-365-0-400ma?_pos=1&_sid=e9d3422c8&_ss=r

    https://edcorusa.com/collections/tube-amplifier-push-pull-output-transformer/products/cxpp60-4-2k-60w-4-2k-ohms-push-pull-tube-output-transformer?variant=41513497362619

    any help would be greatly appreciated

    No. It's not the transformers for a Dynaco ST70 clone. It might work in a EL34 type-amp
    but NFB and other circuit details might need adjustment.
    Blitzen
    Blitzen


    Posts : 59
    Join date : 2009-07-10

    need advice Empty Re: need advice

    Post by Blitzen Sun Jan 15, 2023 5:10 pm

    That power transformer doesn't even have windings for bias, 6.3v filament, and 5v filament! It's certainly not a replacement. The output transformers might work, but as previously stated might require circuit tweaking.
    I'd avoid this- it sound like the seller doesn't know what's what, and that's the real reason for selling...

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    need advice Empty Re: need advice

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