On Mon, 02 Jan 2012 22:26:58 -0500, Garey Barrell wrote:
>There seems to be a lot of confusion over 'silver solder' and 'silver-bearing
>solder'.
Indeed, someone "edumacated" me on the semantics some time back. I've been
asked the question often enough that I still have the display card from the
solder I used right here on my desk. Alpha Fry 62946, Rosin core, 96% tin/4%
silver. Melting point 430F. I think I found it at Ace Hardware.
Tips on soldering 3-500Zs from the internet that I found handy were to place
the tube in an old sneaker to hold it steady while working, and pack wet paper
towel around the junction of the pins under attack and the glass envelope to
keep the seal from overheating. I removed as much of the old, crystallized
solder as I could with a spring-loaded solder sucker ("Soldapullit"). Then I
used lots of flux and fed in fresh solder, applying heat cautiously until I was
sure I had a good joint. Some folks unsolder all the pins and remove them from
the tube wires, but I just did the two filament pins. One of the recovered
tubes is still in service in my L-7, the other is on the shelf as a spare.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and he
will learn for a lifetime."
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org
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