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    Dynaco ST-70 using Sutherland Engineering solid state circuit board

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    Sal

    Posts: 222
    Join date: 2009-02-05
    Location: Central New Jersey Dynaco-ST70.com

    Dynaco ST-70 using Sutherland Engineering solid state circuit board

    Post by Sal on Fri May 07, 2010 8:09 pm

    Hi all,
    I just received a ST-70 to restore that has a Sutherland Engineering solid state board instead of the usual PCB with 7199's. I will be installing a used original board my customer supplied, after recap of course. The SS board is dated 1988, Any opinions on this?

    Regards,
    Sal


    dynacophil

    Posts: 34
    Join date: 2010-10-26
    Age: 57
    Location: Berlin/Germany

    Re: Dynaco ST-70 using Sutherland Engineering solid state circuit board

    Post by dynacophil on Fri Oct 29, 2010 5:06 pm

    a rare beast... I have one too Smile
    but my one is with the optional Bias-Adjust-LEDs Smile




    j4570

    Posts: 117
    Join date: 2010-08-30

    Re: Dynaco ST-70 using Sutherland Engineering solid state circuit board

    Post by j4570 on Fri Oct 29, 2010 8:50 pm

    That's interesting.

    Looks like the board is missing a transistor compared to DynacoPhil's.

    How does it sound?

    Sal

    Posts: 222
    Join date: 2009-02-05
    Location: Central New Jersey Dynaco-ST70.com

    Re: Dynaco ST-70 using Sutherland Engineering solid state circuit board

    Post by Sal on Sat Oct 30, 2010 12:09 am

    I never tried the ST-70 with the SS board especially with the transistor missing. I still have that board in a junk pile. Might play with it one decade.

    Sal

    dynacophil

    Posts: 34
    Join date: 2010-10-26
    Age: 57
    Location: Berlin/Germany

    Re: Dynaco ST-70 using Sutherland Engineering solid state circuit board

    Post by dynacophil on Sat Oct 30, 2010 7:42 am

    sound is fine for me, but not my favourite st-70.
    My is in need because the builder was a solder magician and did a "good" job making solder mountains Suspect instead of joints. He molested the chassis trying to drill out the rivets and additional useless holes... Crying or Very sad it'll get a new chassis or a good used some day. He also managed to destroy the bias board traces while soldering and I had to free-wire-repair his job. It was working when it arrived, but by mistake I guess.

    I believe I ave some reedited datasheets somewhere about which I received with the amp...

    http://dl.dropbox.com/u/11055436/Dynaco/Sutherland/Sutherland-Mod_ST-70_pfade_optimiert.pdf

      Current date/time is Tue Oct 21, 2014 8:32 am