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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


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Maintarget
Laminarman
Sal
7 posters

    ST-120 Assembly

    Sal
    Sal


    Posts : 221
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    ST-120 Assembly Empty ST-120 Assembly

    Post by Sal Wed Jan 29, 2014 11:10 pm

    Hello all,
    Many commented on how I build a tube amp. What ever amp, preamp or kit you build, take your time, don't look at the whole amp or kit and say you can't build it, sure you can, remember, it looks complicated but just follow the instructions, one step at a time whether it is a Bob Latino amp, or a Dynakit amp or a Roy Mottram kit, it is one wire or component at a time. Take your time, it is not a race. Carefully bend your wires to make it neat, solder your components carefully and you to can have a nicely built amp for years of enjoyment.

    Here is a ST-120 I just completed. Use it as a guide on how to dress your wires, make sure you don't have any cold solder joints, use a good soldering iron. I use a 33 watt Unger/Weller soldering iron on 99 percent of the kit except when I solder the audio transformer wires to the speaker terminals with the 5 way binding posts, then I use a 55 watt iron. Use 60/40 or 37/63 good quality rosin core solder and I can't say this enough, take your time!

    Regards,
    Sal

    ST-120 Assembly Newst12001252014c
    ST-120 Assembly Newst12001252014b
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    Laminarman


    Posts : 110
    Join date : 2009-12-30

    ST-120 Assembly Empty Re: ST-120 Assembly

    Post by Laminarman Wed Jan 29, 2014 11:49 pm

    Those wires are so neat and perfectly twisted I'm sure they're Photoshopped  lol! 
    Sal
    Sal


    Posts : 221
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    ST-120 Assembly Empty Re: ST-120 Assembly

    Post by Sal Wed Jan 29, 2014 11:59 pm

    Shhhh, don't tell anyone....
    Maintarget
    Maintarget


    Posts : 227
    Join date : 2013-02-10

    ST-120 Assembly Empty Re: ST-120 Assembly

    Post by Maintarget Thu Jan 30, 2014 11:01 pm

    Very nice job Sal on the amp and great advise for the newbie.
    Dave_in_Va
    Dave_in_Va


    Posts : 446
    Join date : 2013-04-02
    Location : Mid. VA

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    Post by Dave_in_Va Fri Jan 31, 2014 12:42 am

    Sal is A-okay!
    My ST 70 is epic. Thanks.
    sKiZo
    sKiZo


    Posts : 1530
    Join date : 2013-04-01
    Location : Michigan USA

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    Post by sKiZo Fri Jan 31, 2014 1:33 am

    Secret weapon for twisting wires ...

    ST-120 Assembly 203451

    Shhhhhh ...
    arledgsc
    arledgsc


    Posts : 504
    Join date : 2012-11-30

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    Post by arledgsc Fri Jan 31, 2014 10:37 am

    Wow! Impressive job!
    maz
    maz


    Posts : 8
    Join date : 2013-12-30

    ST-120 Assembly Empty Re: ST-120 Assembly

    Post by maz Wed Feb 05, 2014 5:23 pm

    Not only is it a 'looker', it sounds pretty darn good too! Very Happy 
    Thanks Sal!
    sKiZo
    sKiZo


    Posts : 1530
    Join date : 2013-04-01
    Location : Michigan USA

    ST-120 Assembly Empty Re: ST-120 Assembly

    Post by sKiZo Fri Feb 07, 2014 3:42 pm

    That's always the best part. When it actually works!  tongue 

    Only thing I'd change in your approach is your choice of irons. I did the pencil thing for a long time and finally invested in a decent soldering station ... there's no going back. A bit over 700F with almost immediate recovery after a joint is hard to beat.

    The Weller WES51 analog is even a real decent price. Only difference I see between that and the much more expensive digital version is the readout.

    ST-120 Assembly 420-125.01_s500_p1._V26e0e18c_

    The pencil itself is very lightweight with a super flexible cord, and skinny enough to get into some really tight places too. Bonus, it's ESD grounded, so no zapping the sensitive parts.

    Of course, first thing you do is scrap the crappy sponge and go with a nice brass cleaner ...

    ST-120 Assembly MCM-Tip-Cleaner

    Only maintenance there is to pop out the brass every now and then and give it a shake to get the old solder out.

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