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    ST-70 local to me

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    evoroadster

    Posts : 39
    Join date : 2015-06-16
    Age : 66
    Location : Honolulu, Hawaii

    ST-70 local to me

    Post by evoroadster on Sun May 15, 2016 2:07 am

    We don't get too many tube amps popping up on Craigs List here on Oahu but here is one:

    https://honolulu.craigslist.org/oah/ele/5545763828.html

    I have never seen a cover like this over the circuit board. I am thinking of looking at it tomorrow. Opinions welcome.

    stewdan

    Posts : 161
    Join date : 2010-03-07
    Age : 78
    Location : Houston Texas

    Dynaco ST-70A?

    Post by stewdan on Sun May 15, 2016 10:05 am

    Hi --- I believe there was a factory built ST-70A that had a metal cover over the PCB and had a different color PCB (Light Green??). I saw a picture of one, once, when the Radio Shack Catalog listed Dynaco Products back in the late 1960's or early 1970's??

    stewdan

    Posts : 161
    Join date : 2010-03-07
    Age : 78
    Location : Houston Texas

    Dynaco 70A

    Post by stewdan on Sun May 15, 2016 10:09 am

    Hi again --- just looked more closely at your pictures --- lower left corner of the left and middle pictures say "70A".

    evoroadster

    Posts : 39
    Join date : 2015-06-16
    Age : 66
    Location : Honolulu, Hawaii

    Re: ST-70 local to me

    Post by evoroadster on Sun May 15, 2016 12:29 pm

    Thanks for the info. I found a very nice write-up of the ST-70A here:

    http://www.audiocircle.com/index.php?topic=60831.0

    daveshel

    Posts : 147
    Join date : 2011-11-06
    Location : Tucson AZ USA

    Re: ST-70 local to me

    Post by daveshel on Sun May 15, 2016 3:30 pm

    That's in great shape. I'd go for it. Even though I believe the ST-70 is overrated compared to the ST-35 or the MK-III, that's a steal for a clean factory wired unit in an obscure market. If you're not nuts about the sound, you should be able to easily recoup your investment.

    evoroadster

    Posts : 39
    Join date : 2015-06-16
    Age : 66
    Location : Honolulu, Hawaii

    Re: ST-70 local to me

    Post by evoroadster on Wed May 18, 2016 4:26 pm

    So, the question is: Do I go for this one and update it with a VTA board and cap can or just go ahead with my original plan of building one of Bob's VTA-70 kits? Around $1100 with options with Bob's kit vs $750 all in for the Craigslist amp.

    Bob Latino
    Admin

    Posts : 2411
    Join date : 2008-11-26
    Location : Massachusetts

    Re: ST-70 local to me

    Post by Bob Latino on Wed May 18, 2016 6:26 pm

    evoroadster wrote:So, the question is:  Do I go for this one and update it with a VTA board and cap can or just go ahead with my original plan of building one of Bob's VTA-70 kits?  Around $1100 with options with Bob's kit vs $750 all in for the Craigslist amp.

    Some of the original Dynaco ST-70's date as far back as 1959 .. That amp could well be 50+ years old. About the only thing that still stands the test of time are the output transformers. Everything else on the original Dynaco ST-70 was a compromise so that they could sell the kit or wired amps at relatively low prices. Older original Dynaco ST-70's are not a good amp to be used as a "daily driver" unless they are completely rebuilt. If you do purchase that amp, plan on sinking some $$$ into the amp if you intend to use the amp on a daily basis. Read at the forum link below that compares an original Dynaco ST-70 to new VTA ST-70.

    Comparison > original Dynaco ST-70 and a VTA ST-70

    Bob

    evoroadster

    Posts : 39
    Join date : 2015-06-16
    Age : 66
    Location : Honolulu, Hawaii

    Re: ST-70 local to me

    Post by evoroadster on Wed May 18, 2016 8:48 pm

    Thanks Bob, that is the way I will go. I have no real desire to save the ST-70A as a museum piece nor do I really want to tear it up to bring it into the 21st century. I already went through that with a SCA-35.

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