Unless your scope has a small coil of solder inside, which was standard
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issue back then, IMHO the closest readily available solder is SN62. It
is eutectic solder (63% Tin, 37% lead) with 2% silver added. It has
enough silver not to leach the silver from the ceramic strips and melts
at a low temperature.
I would never use Lead Free solder on anything I cared about.
On 2019-11-01 19:53, Jamie Ostrowski wrote:
Also, it's at the 5:35 mark in that video where they specify the exact
composition needed...just fyi.
On Fri, Nov 1, 2019 at 9:50 PM Jamie Ostrowski <jamie.ostrowski@...>
60% tin/ 37% lead, and 3% SILVER...sorry for the typo!
On Fri, Nov 1, 2019 at 9:49 PM Jamie Ostrowski <jamie.ostrowski@...>
Tektronix in the 50's said the actual correct solder is 60% tin, 37%
lead, and 3% solder. The details are highlighted in this video, made in the
50s by Tektronix, for soldering to ceramic strips.
Here is the video which covers the procedure in detail:
Maybe 2% would work, but if you're working on restoring a 555, why take
the chance on compromise?
Just me! :-)
Good luck with your project.
On Fri, Nov 1, 2019 at 9:26 PM Richard R. Pope <mechanic_2@...>
I would use the same solder that the original builders used. 60/40
or 63/37 lead/tin rosin core solder.
GOD Bless and Thanks,
On 11/1/2019 9:08 PM, greenboxmaven via Groups.Io wrote: I am beginning restoration on a 555 I got a few months ago. What is
the correct alloy of solder for the ceramic tie strips? I have found
both tin/lead/silver and lead-free, both with 2% silver content . Are
these satisfactory? Is 2% silver enough, or is a richer alloy needed?
Thanks, Bruce, KA2IVY