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Thread: Radford STA 12 Rebuild

  1. #1
    Join Date: Oct 2017

    Location: West Wales

    Posts: 60
    I'm Alan.

    Default Radford STA 12 Rebuild

    Hi Everyone,
    I'm new to posting on Aos so please treat me kindly. And I hope I have chosen the right place to post... So here goes.

    As a long time fan of Radford, I recently acquired a very sad STA12.
    This one had suffered more than most. Clearly in the past it had had the reservoir/smoothing cap explode. There was sticky residue and flakes of paper and foil under everything. I guess that was the start of 'someone' fixing it up and 'modifying' it. Triode connected outputs and shared cathode bias resistor, components dangling on bits of wire and so on.
    Then it had clearly been dropped and the transformer chassis badly bent together with the outer frame.

    Only one thing to do, a total rebuild. This is where I am to so far, the is chassis stripped, cleaned and straightened:-




    I'm missing a few parts, especially an output transformer, so please look out I will be on the scrounge!
    Alan

  2. #2
    Join Date: May 2011

    Location: Glasgow

    Posts: 6,844
    I'm Brian.

    Default

    Hi Alan , welcome to AOS . I'll be watching this thread with interest

    Enjoy the forum
    Regards
    Brian

    Sell your cleverness and buy bewilderment . (Rumi )


    Korus Computer Audio music server .
    DAC 3 French DAC
    Amplifier : Rega Brio R
    Speakers : Tannoy 637
    Interconnects : MS Audio / Klotz MC5000 .
    Speaker cables : Chord Epic Twin

  3. #3
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 3,538
    I'm Alex.

    Default

    Very interesting. I shall be following too.

    I wonder if Radford Revival can help.

    I'm a long time owner of an STA25 III, probably more than 40 years.
    Spendorman

  4. #4
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 37,251
    I'm Geoff.

    Default

    Quote Originally Posted by spendorman View Post
    I wonder if Radford Revival can help.
    That idea crossed my mind. I'd expect they'd have some spare parts and could possibly match the enamel too for touching in purposes.

  5. #5
    Join Date: Oct 2017

    Location: West Wales

    Posts: 60
    I'm Alan.

    Default

    Guy's thanks for the Radford Revival tip, and Will says, ''rarer than hens teeth!''
    My best bet will be a pair of later T2063s, anyway I've put a Wanted Ad up just in case.

  6. #6
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 3,538
    I'm Alex.

    Default

    Rare, yes, but I would have thought an STA20 was even rarer. I just happen to know someone that owns one! (not me).
    Spendorman

  7. #7
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 37,251
    I'm Geoff.

    Default

    It's worth keeping an eye on ebay. There may be a compatible transformer from a non Radford design, although obviously an original would be desirable.

  8. #8
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 3,538
    I'm Alex.


  9. #9
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,399
    I'm Alan.

    Default

    Welcome to AoS from another Alan

    Great start to your project. Good luck with the hunt for a transformer.

  10. #10
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 3,538
    I'm Alex.

    Default

    There is a lot of interesting info here by Jim Lesurf: http://www.audiomisc.co.uk/HFN/Radford/revisited.html
    Spendorman

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