Joseph,
The only place where I have seen low thermal solder used was in the OLD
TEK tube scopes in only one special place. Those OLD tube scopes had a
few ceramic standoffs that had a number of cupped spaces with metal
surfaces bonded with some kind of glue that could not take a lot of
heat. These standoffs were used, at the time, for providing a high
impedance, low leakage connection point.
We are talking in the 1950 and 1960's time frame. Later in time TEFLON
became the choice for such use.
Bill....WB6BNQ
Joseph Gray wrote:
Volker,
I came across a couple of old Fluke differential voltmeters that need some
work. I thought it would be best to use low thermal EMF solder on these.
Joe Gray
W5JG
On Mon, Aug 12, 2013 at 10:39 AM, Volker Esper <[email protected]> wrote:
Sorry, Joe, if my question was mistakable. I wanted to know your
application. Maybe I'd recommend not using a special solder alloy rather
than going the long way of aquiring it.
I give you an example: When fixing a 6.5 digit DMM (HP34401A) I wasn't
sure if I might use a special alloy to solder the pins of an input relay.
In the end I did not. Comparing this fixed unit to a second one in several
automated 24 hours tests with varying room temperatures, there seem to be
no measurable differences between the two. So in this case it appears to be
of no great importance using a special solder.
Enthough the thermoelectric voltages at these pins are not negligible and
therefore have to be considered, other effects obviously are of much more
effect. So, as I mentioned, using a special soldering alloy drops in the
priority list.
Now, that I'm curious, please let us know, what you are using the solder
for.
Volker
DF9PL
Am 12.08.2013 15:06, schrieb Joseph Gray:
As I asked in my original message, I'm trying to find out where I can buy
a
small quantity of rosin-core 10/90 (tin/lead) solder. I don't want to buy
it in bar form from China.
Joe Gray
W5JG
On Mon, Aug 12, 2013 at 3:17 AM, Volker Esper<[email protected]> wrote:
sorry, spelling mistake:
"What do you _want_ it for?"
Remember, those solder alloys are optimized for a specific alloy
combination only, e.g. Cu-Cu.
Volker
Am 12.08.2013 10:39, schrieb Volker Esper:
Hi Joe,
What are you looking for, Cadmium-Solder, or Sn10Pb90, which is
Stannum/Plumbum-only?
And what do you what it for? In (very high) precision applications there
are so many issues to consider that the solder doesn't appear to be at a
high priority...
Volker
Am 12.08.2013 00:38, schrieb Joseph Gray:
Reading through the archives, I saw that there was some discussion
about
a
safer alternative to cadmium-based solder. The low tin, high lead alloy
was
recommended as a good low-thermal EMF substitute. However, I did not
see
any recommendations on where to buy some of this.
I just did some searching and all I come up with is bar solder, mostly
from
China. Where can I buy a small quantity of rosin-core 10/90 solder?
Mouser,
which is my preferred vendor certainly didn't list any. I would think
that
even 1/2 pound would last me a lifetime.
Joe Gray
W5JG
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