I am out there looking for 60/40 solder too. Scored a big 5 lb. roll from RCA
in Indianapolis. It was 7 years old, but still shrink wrapped, shiny and clean
for $5.00!! I should have bought the 2 other rolls. Ersin multicore is one of
my favorites too. Got a 1 lb. 2% silver roll at a tractor show for $3.00. You
never know where it will turn up! At the same show I also got 5 new B&K 100
MHz scope probes and a bunch of other cables for $10.00 and 4 500' rolls of
silver plated Teflon wire for $40.00.
Randy.
Randy E. Randall AB9GO
Network Engineer
UC Health
Randy.Randall@UCHealth.com
Phone 513-585-7146
Fax 513-585-7159
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Gene May
Sent: Thursday, August 30, 2012 12:11 PM
To: Amplifier Mailing List
Subject: Re: [Amps] current threads about silver solder and resoldering
Some discussants in this have mentioned buying old solder at hamfests, etc. I
do the same, but it is important to read labels carefully. The solder that has
the lowest melting point is (by weight) 63% tin (Sn), 37% lead (Pb). This
ratio also has the same temperatures for "starts to melt" and "completely
melted"; i.e., no temperature range with "pasty" solder. Note well the greater
amount of tin, not lead, because tin melts at a lower temperature than lead.
Note also that tin is more expensive than lead.
60Sn/40Pb melts very close to 63Sn/37Pb, and has only a small pasty range.
Unfortunately, I have occasionally seen "60/40" solder for sale that, upon
reading the SMALLER print, is 60Pb/40Sn. This stuff melts at a significantly
higher temperature than 60Sn/40Pb and has a large "pasty" temperature range,
and IMHO, is a pain to use.
Of course, I'm sure that no one is trying to mislead anyone in order to save a
few cents.
Gene May
WB8WKU
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