The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all products and all products

    Which ST70 Kit To Buy



    Posts : 23
    Join date : 2013-10-16

    Which ST70 Kit To Buy

    Post by EddieGnz1 on Sun Oct 27, 2013 7:46 pm

    what is the difference (as objectively as possible) between the following three kits;



    3) < insert another kit option here that I'm not aware of >

    I've never owned a tube amp and i've never built one but my ears are very well trained because I've sold high end tube amps and i've heard myriad high end configurations.  But I'm now starting to learn about building them and I love the DIY approach.  Rather than just being told that one kit is better, I'd like to find out why exactly what makes it better and how does it make it better.

    anything you can teach me on the differences would be greatly appreciated.

    kind thanks,


    Posts : 1293
    Join date : 2013-04-01
    Location : Michigan USA

    Re: Which ST70 Kit To Buy

    Post by sKiZo on Sun Oct 27, 2013 8:43 pm

    One of each ... clown 

    Check out the ST120 ... you'll see a lot of praise for that one ...


    Posts : 113
    Join date : 2013-01-29
    Age : 52
    Location : Switzerland

    Re: Which ST70 Kit To Buy

    Post by Zimmer64 on Mon Oct 28, 2013 4:38 am

    I posted pretty much the same question on the DIYAUDIO forum and ended up with tubes4hifi ST70. No regrets and would do,it again.



    Posts : 131
    Join date : 2009-12-23
    Location : Valley Stream, NY

    Re: Which ST70 Kit To Buy

    Post by anbitet66 on Mon Oct 28, 2013 9:23 am


    There is a third option:

    I bought the board and then proceeded to build a "kit" from new parts scrounged from around the internet.  The actual kit offered by Triode Electronics looks the least like an ST70 including a modern fuse holder and IEC power connector in back, the input jacks are mounted through the chassis, no front facing octal plugs, etc...  It is another option.

    I would suggest the tubes for hifi version since it uses an improved driver circuit, not a rehash of the original driver board like the one from Triode Electronics, or the stock equivalent from dynakit parts.  If your aim is to be nearly authentic, then go with the dynakit parts version.  If stock appering at first glance but improved sonics, go with the tubes4hifi version.  The triode electronics board falls somewhere inbetween the two for performance.  I happen to like it, but then I did build it before I knew others were out there and I'm too cheap to pull out the driver board and replace it with something else.



    Posts : 331
    Join date : 2012-11-30
    Location : SF Bay CA

    Re: Which ST70 Kit To Buy

    Post by arledgsc on Mon Oct 28, 2013 10:34 am

    Based upon my experience with the ST-120 amp I would not hesitate to recommend the Bob Latino ST-70.   The chassis is stronger, the low-gain board provides individual bias adjustment for each power tube (huge plus), transformers are first class and conservatively rated. and excellent support.   I'm not sure how the "triode electronics" EF86 driver board would sound.  Guitar amps I have heard with EF86s are screechy.  The "dynakit" version seems much like a replica of the original ST-70 with all its design shortcomings.  So there is a lot of love for the Bob Latino amps and seems like Bob and Roy have addressed all the issues with the original design.  As suggested above you should also consider the ST-120.  I use it everyday, does not disappoint, and the best point is it sounds really good! Nonetheless, Bob's ST-70 amp may cost a few bucks more with options but well worth the slight difference in cost.


    Posts : 383
    Join date : 2008-12-05

    Re: Which ST70 Kit To Buy

    Post by PeterCapo on Mon Oct 28, 2013 11:00 am

    Frankly, I don’t think you can go wrong with any of them.  Personally, I feel the original design sold by Dynakitparts is still a fine contender, especially if you level the playing field – try it with the Triode USA 500uF cap board, a fast diode like a hexfred or Cree ZRec SiC in the bias supply, and the Dynakitparts bias balance control.  You probably have more tube rolling options with the others, though.  Again, they’re all good.

    Last edited by PeterCapo on Tue Oct 29, 2013 10:09 am; edited 1 time in total


    Posts : 1293
    Join date : 2013-04-01
    Location : Michigan USA

    Re: Which ST70 Kit To Buy

    Post by sKiZo on Mon Oct 28, 2013 2:09 pm

    And not to forget, any kit is just a starting point ... I made a few changes to my ST120 and that was half the fun.

    All important though ... do your homework and evaluate your needs prior to pulling the trigger. Put some thought into how much power you'll need to give you what you want to hear. Preferred genre, listening levels, speaker efficiency, and the room characteristics have a LOT to do with that.

    Your most important tool is patience, but a good soldering station is a big plus also ... wouldn't want to attempt it with a RatShack pencil iron ...


    Posts : 30
    Join date : 2010-10-05
    Location : North Shore,Ma.

    Re: Which ST70 Kit To Buy

    Post by dmag on Tue Nov 05, 2013 7:17 pm

    I built triode, dynakit and tubes4hifi.The st70 triode kit for my first project. I would not recommend it.
    I work in marine electronics, so I have no trouble with the tools and assembly.
    However the triode kit assumes you have some basic amplifier knowledge and terms ,which I had none. It was a bitch. More frustrating than fun. The manual wasn't much help in many cases.
    Dynakit with the bias kit option was my favorite. Straightforward. And the original manual was intended for newbies. I'll buck the trend and suggest the quad cap. And skip the el34's and get a quad of Russian 6p3s-e from Jim McShane . He is a very good tube dealer.They sound great ,IMHO. Be sure to adjust the bias for that type tube.
    As far as 7199's go they may cost more ,but since you won't get caught up in rolling them you'll save enough cash to do a mod or two.
    The first project is best simple with instant gratification, and once you start modding, if you do ,a cap board or driver board are easy to do.
    The st35 is also a great option. Initial investment is lower, and el84's have a very nice sound.

    Sponsored content

    Re: Which ST70 Kit To Buy

    Post by Sponsored content Today at 10:45 am

      Current date/time is Thu Oct 27, 2016 10:45 am