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    ST-120 Assembly

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    Sal

    Posts : 223
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    ST-120 Assembly

    Post by Sal on 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



    Laminarman

    Posts : 110
    Join date : 2009-12-30

    Re: ST-120 Assembly

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

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

    Sal

    Posts : 223
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    Re: ST-120 Assembly

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

    Shhhh, don't tell anyone....

    Maintarget

    Posts : 208
    Join date : 2013-02-10

    Re: ST-120 Assembly

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

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

    Dave_in_Va

    Posts : 128
    Join date : 2013-04-02

    Re: ST-120 Assembly

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

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

    sKiZo

    Posts : 1285
    Join date : 2013-04-01
    Location : Michigan USA

    Re: ST-120 Assembly

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

    Secret weapon for twisting wires ...



    Shhhhhh ...

    arledgsc

    Posts : 330
    Join date : 2012-11-30
    Location : SF Bay CA

    Re: ST-120 Assembly

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

    Wow! Impressive job!

    maz

    Posts : 9
    Join date : 2013-12-30

    Re: ST-120 Assembly

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

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

    sKiZo

    Posts : 1285
    Join date : 2013-04-01
    Location : Michigan USA

    Re: ST-120 Assembly

    Post by sKiZo on 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.



    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 ...



    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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