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    My DIY ST70



    Posts : 6
    Join date : 2012-10-05

    My DIY ST70

    Post by nraghunadh on Mon Nov 05, 2012 2:45 pm

    I have finished my st70 last week. I used PC3 clone and 7199 driver tubes.
    I used original 50's design and changed to look only. Many thanks to bob, i have followed the bob's tips to make it.
    Now i am using 6L6 and KT88 tubes. I need to buy good EL34 tubes for this amp
    I am posting final amp photos and giving the Picasa link for work progress photos.



    Posts : 58
    Join date : 2011-05-09
    Location : Albuquerque

    Re: My DIY ST70

    Post by Westy56 on Sat Nov 24, 2012 8:26 pm

    By far, that's the nicest stock circuit ST-70 I've seen.



    Posts : 1
    Join date : 2012-11-25

    Re: My DIY ST70

    Post by TedWilli on Sun Nov 25, 2012 1:52 pm

    Beautiful! Ditto, Westy56


    Posts : 1
    Join date : 2013-01-10

    Very nice!

    Post by Musicman625 on Thu Jan 10, 2013 11:48 am

    That is really fine.
    Curious, what kind of "pf" caps did you use?


    Posts : 6
    Join date : 2012-10-05

    Re: My DIY ST70

    Post by nraghunadh on Thu Jan 10, 2013 11:57 am

    Musicman625 wrote:
    That is really fine.
    Curious, what kind of 390pf caps did you use?

    I used Murata 400PF +/-10%

    Link for Photo:


    Posts : 3
    Join date : 2013-10-07
    Location : Westchester, New York

    Re: My DIY ST70

    Post by joeysanchez on Mon Oct 07, 2013 1:46 am

    WOW !!!!!


    Posts : 19
    Join date : 2011-07-18

    Re: My DIY ST70

    Post by Donkeyshins on Mon Dec 30, 2013 2:48 pm

    Very nicely done!  Handy to have access to a milling machine, isn't it! If you are looking for different tubes, I highly recommend a set of Golden Lion KT77 tubes. They sound better, IMHO, than stock Dynaco-Mullard 6CA7s.

    So what was your reason for going with the stock Dynaco driver circuit as opposed to a board that uses more readily accessible tubes?


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