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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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Earl
peterh
markeby
jonny6336
8 posters

    New construction st120

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    mijohn


    Posts : 97
    Join date : 2013-06-19

    New construction st120 - Page 2 Empty Re: New construction st120

    Post by mijohn Thu Aug 12, 2021 9:38 pm

    edman44 wrote: I was wondering why you chose to have your transformer made in Italy cost of shipping? Thinking I would like a trio for mine if they are better for the amp? lol.
    I guess because he lives in Italy and shipping from the USA was too expensive.

    jonny6336 likes this post

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    jwb474


    Posts : 34
    Join date : 2014-07-13

    New construction st120 - Page 2 Empty Re: New construction st120

    Post by jwb474 Fri Aug 13, 2021 3:39 am

    I also like the auto-bias setup. The auto-bias assembly can be bought from Eahard Audio: https://www.erhard-audio.com/AB-Q-ST70-ST120.html.

    A couple of recommendations for using the auto-bias. I would conformal coat both sides of the pwb with Humid-Seal or some other brand. While the circuit spacings are theoretically OK for the voltages, as time goes by and dust accumulates amid humid conditions there is a danger of a flash over especially if the HIV input option is used. Also install the cathode fuse/varistor mod.

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    jonny6336
    jonny6336


    Posts : 25
    Join date : 2018-01-31
    Age : 43
    Location : Italy

    New construction st120 - Page 2 Empty Re: New construction st120

    Post by jonny6336 Fri Aug 13, 2021 6:37 pm

    mijohn wrote:
    edman44 wrote: I was wondering why you chose to have your transformer made in Italy cost of shipping? Thinking I would like a trio for mine if they are better for the amp? lol.
    I guess because he lives in Italy and shipping from the USA was too expensive.


    exactly

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    New construction st120 - Page 2 Empty Re: New construction st120

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