Re: Correct Silver solder


Unless your scope has a small coil of solder inside, which was standard
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.

Steve Hogan

714 904-6636

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

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