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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


    My second ST-70 rebuild

    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

    My second ST-70 rebuild Empty My second ST-70 rebuild

    Post by richtp on Sat Dec 03, 2011 11:04 am

    Here is my second Dynaco ST-70 that I picked up a few weeks ago. I am going to do a rebuild on it.


    My second ST-70 rebuild IMG_0113

    My second ST-70 rebuild IMG_0114



    Here it is with the cover off. It had about 1/4" of dust on it!



    My second ST-70 rebuild IMG_0116

    My second ST-70 rebuild IMG_0117



    Here's a pic next to my othe ST-70 before I stripped it down to the chassis

    My second ST-70 rebuild IMG_0123



    I stripped it down to the Chassis and cleaned off all the rust and corrosion and I am painting the transformers now.
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Sat Dec 03, 2011 11:24 am

    Stripping down the chassis

    My second ST-70 rebuild DSCF6951

    My second ST-70 rebuild DSCF6959

    My second ST-70 rebuild DSCF6967

    My second ST-70 rebuild DSCF6964
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Sun Dec 04, 2011 4:57 am

    The Chassis cleaned up better than I had thought. I planned on powder coating it but I think I will use it as is. It still has some pitting.




    My second ST-70 rebuild DSCF6986-1








    My second ST-70 rebuild DSCF6990
    Bob Latino
    Bob Latino
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    Location : Massachusetts

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    Post by Bob Latino on Thu Dec 08, 2011 12:21 pm

    Nice job ... I love seeing Dynaco amps rescued from the scrap heap and redone. When you are done you should post a photo of the completed rebuild right next to the photo of yours below which shows the amp under a heavy layer of dust. Take the photo of the completed rebuild from the same angle as the photo below ...

    Bob


    My second ST-70 rebuild IMG_0116

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    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Thu Nov 27, 2014 4:23 pm

    Finally assembled the ST-70 after 3 years of it sitting on the shelf. I have yet to do any testing or plug it in. With luck I should be testing it tomorrow!


    My second ST-70 rebuild <a href=My second ST-70 rebuild Collage2014-11-2714_31_15" />
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    Post by Guest on Thu Nov 27, 2014 9:40 pm

    very nice indeed, great job on the rebuild!
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Sun Nov 30, 2014 12:41 pm

    Thanks! It was a lot of fun! I am very happy with how it turned out! Sounds great! It's the first Tubes 4 HiFi driver board I have tried. I put some Russian PIO caps in it as well. Haven't had much opportunity to play it yet but I am very happy with it.

    I wanted to replace the chassis because of pitting on the top. I polished it up good but the pitting just returned. I tried polishing it and clear coating it but it looked pretty bad. I ended up painting the top with a brown hammered paint. Didn't think I'd like that, but I think it looks pretty cool. I hope to build a wood base out of mahogany at some point as well.
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Sun Dec 29, 2019 8:18 pm

    My second ST-70 rebuild 40f80d10

    Still running strong after 8 years! Thinking about making some changes though.


    Last edited by richtp on Sun Dec 29, 2019 8:35 pm; edited 1 time in total
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Sun Dec 29, 2019 8:32 pm

    My second ST-70 rebuild 1652c610
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    Dale Stevens

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    Location : Loris, SC

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    Post by Dale Stevens on Mon Dec 30, 2019 12:13 pm

    Hey, man; That is one more cool job. Nice going. But we all have to ask: what's in the glass in your 2cd post?? Happy New Year. Dale
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Mon Dec 30, 2019 2:39 pm

    Haha, I honestly don’t remember what was in the glass! Must have been good, I emptied it. Happy new year.
    richtp
    richtp

    Posts : 53
    Join date : 2011-11-18
    Location : Sterling MI

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    Post by richtp on Mon Dec 30, 2019 2:47 pm

    My second ST-70 rebuild F0aac610
    My second ST-70 rebuild 02a78710
    My second ST-70 rebuild De788710

    More pics of what I’m running right now.

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