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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


    The ST70 Resurrection continues with the ST70 Resurrection Restoration Project

    jrubin
    jrubin

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    Post by jrubin on Fri Mar 22, 2019 10:56 pm

    ..


    Last edited by jrubin on Mon Aug 12, 2019 8:24 am; edited 4 times in total
    pichacker
    pichacker

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    Post by pichacker on Mon Mar 25, 2019 8:27 am

    Nice one so far.... I like the covert pots in the front tube sockets.

    But back to poasts 13 and 14 re your bias supply....
    https://dynacotubeaudio.forumotion.com/t3996-the-st70-resurrection-continues-with-the-st70-resurrection-restoration-project#39213

    And is that really still the selinium rectifier I see in there or have you tucked a 1N4007 away out of sight across it's contacts?
    jrubin
    jrubin

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    Post by jrubin on Mon Mar 25, 2019 11:02 pm

    pichacker wrote:Nice one so far.... I like the covert pots in the front tube sockets.

    But back to poasts 13 and 14 re your bias supply....
    https://dynacotubeaudio.forumotion.com/t3996-the-st70-resurrection-continues-with-the-st70-resurrection-restoration-project#39213

    And is that really still the selinium rectifier I see in there or have you tucked a 1N4007 away out of sight across it's contacts?

    Yes its really a Selenium rectifier. They came standard with the ST70
    jrubin
    jrubin

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    Post by jrubin on Wed Mar 27, 2019 9:41 pm

    ..


    Last edited by jrubin on Mon Aug 12, 2019 8:23 am; edited 1 time in total
    jrubin
    jrubin

    Posts : 85
    Join date : 2015-08-28

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    Post by jrubin on Mon Apr 08, 2019 9:59 pm

    ..


    Last edited by jrubin on Mon Aug 12, 2019 8:23 am; edited 1 time in total
    jrubin
    jrubin

    Posts : 85
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    Post by jrubin on Mon Apr 08, 2019 10:02 pm

    The ST70 Resurrection continues with the ST70 Resurrection Restoration Project - Page 2 LIra1wZl



    The ST70 Resurrection continues with the ST70 Resurrection Restoration Project - Page 2 5NQh44ol



    The ST70 Resurrection continues with the ST70 Resurrection Restoration Project - Page 2 CV7a4scl



    The ST70 Resurrection continues with the ST70 Resurrection Restoration Project - Page 2 3XSNps9l



    The ST70 Resurrection continues with the ST70 Resurrection Restoration Project - Page 2 7E5VllOl
    jrubin
    jrubin

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    Post by jrubin on Mon Apr 08, 2019 10:04 pm

    This project is complete and now in final editing
    jrubin
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    Post by jrubin on Mon Apr 15, 2019 8:30 pm

    The Original Post in this thread has been updated to include the first Video in this series.
    jrubin
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    Post by jrubin on Mon May 13, 2019 8:04 am

    The Original Post in this thread has been updated to include the Second Video in this series.
    jrubin
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    Post by jrubin on Mon Jun 10, 2019 8:11 am

    Part 3 of this series has been added to the beginning of this thread under parts 1 and 2
    jrubin
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    Post by jrubin on Mon Jul 08, 2019 8:14 am

    Part 4 has been posted to original post
    jrubin
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    Post by jrubin on Mon Aug 12, 2019 8:23 am

    The Original Post in this thread has been updated to include the fifth Video in this series.
    jrubin
    jrubin

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    Post by jrubin on Tue Oct 01, 2019 8:37 am

    Having been requested upon restoration of my newly restored Dynaco Dynakit ST70 Amplifier, I've decided to test out the Amp by directly connecting the Commodore to it, and attenuating the signal instead of using a pre-amp. A visual output of the signal will further be my restored 1950's Heathkit laboratory oscilloscope. After setting the volume I just roll right into the demo songs. Enjoy.


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