[R-390] Silver solder

Mon, 24 Jun 2002 20:32:05 -0400

It does have a silver content Norm.
The reason silver solder is needed is that the ceramic was made solderable
by firing silver onto it.
Ordinary lead solder will "eat up" the silver making it no longer
solderable.  The idea is that the solder is partially saturated
with silver so that little of the silver from the ceramic strip will
dissolve into the molten solution.
There doesn't have to be a lot of silver in the solder to prevent this from
happening , 3% is what Tek supplied,
but overheating will still destroy the solderability.

Scott

R-390A currently being rebuilt
R-390 currently on it's way!

----- Original Message -----
From: <[email protected]>
To: <[email protected]>; <[email protected]>; <[email protected]>
Sent: Monday, June 24, 2002 8:09 PM
Subject: Re: [R-390] Silver solder

> Hi fellow solderers,
>
> Dan has me wondering.  The most common solder sold in parts houses when I
was
> buying same was 60/40 Ersin multicore which worked just fine for most all
> electronic repair and construction use.  On all of our Tektronic
equipment,
> however, we were cautioned not to use common electronic solder but the
solder
> contained on captivated little plastic spools within the equipment.  I
don't
> recall now what its composition was but believe it may have had silver
> included.  Does anyone have a better idea about this?
>
> 73,
>
> Norm Hall, W6JOD
>
>
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