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Tektronix special solder

Discussion in 'Electronic Design' started by Jim Hawkins, Aug 14, 2007.

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  1. Jim Hawkins

    Jim Hawkins Guest

    Is there an old-timer out there who remembers the special solder that had to
    be used on those ceramic component mounts in the 500-series scoopes?
    What was the composition of the solder, and is it still available anywhere ?
    I have a 556, and may need to replace some components.

    Jim Hawkins
     
  2. Winfield

    Winfield Guest

    You could get some of Zephyrtronics "LowMelt® DeSolder"
    http://www.zeph.com/lowmelt.htm and use it for soldering.
     
  3. It was a silver-loaded solder to avoid silver
    being leached-out of the mounts, but I can't
    remember the exact composition.
     
  4. This is a pretty standard low-melt solder - pretty easily available, e.g. for SMD work, although you
    may not find it as thick as you might like for this type of work.

    ISTR these scopes having a little coil of it stored inside somewhere for repairs.
     
  5. Bingo. Here's a source for it, or at least something that is supposed
    to work in that application:

    http://www.reprise.com/ash/clients2/Parts_Shop/ceramic_strips.html



    Best regards,
    Spehro Pefhany
     
  6. Jim Yanik

    Jim Yanik Guest

    IIRC,it was 3% silver,but I can't recall the tin/lead percentages.
    Maybe 60/37/3?
    Silver-bearing electronic solder is still available,AFAIK,but probably not
    from TEK.

    As another poster mentioned,there's usually a small spool of it mounted on
    the chassis somewhere;the spool is about 1 inch in diameter,white
    plastic.It has a pin that goes thru a grommet on the chassis,like the
    terminal strips mount.It just pulls off.
     
  7. DJ Delorie

    DJ Delorie Guest

    I'm not old! :p
    I was told back then that it was a type of silver solder, but my 561A
    had a small spool of it internally. I still have it, too - both the
    scope and the solder.
    I have a 561A that almost works. The left/right deflection stuff is,
    well, "unusually nonlinear" at best. I've got three plugins -
    tiembase, single trace, and dual trace. Haven't used it in ages.
     
  8. scada

    scada Guest

    My 503 manual says to use solder with 3% silver, Tek part # 251-514.
     
  9. scada

    scada Guest

  10. Robert Baer

    Robert Baer Guest

    62Tin-36lead-2silver alloy.
    Have an 1oz roll by Kester (will last you 200 years) and you are
    welcome to have it.
     
  11. Robert Baer

    Robert Baer Guest

    I would dare say "low melt" refers to use of bismuth...a no-no!
     
  12. Jim Yanik

    Jim Yanik Guest

    that would be 3%,not 0.3%. 3% adds up to an even 100%.

    Also,the p/n now translates to 214-0514-00,in the current TEK part number
    format. A 1 lb spool.
     
  13. Jim Yanik

    Jim Yanik Guest

    whats so bad about bismuth?
     
  14. scada

    scada Guest

    Yeah, I did a copy & paste from the web page...I didn't look back!
     
  15. Robert Baer

    Robert Baer Guest

    That solder is guaranteed to leach out the silver, and if the
    equipment over heats, the connections become very prone to fail open.
     
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