Don -
There seems to be a lot of confusion over 'silver solder' and 'silver-bearing
solder'.
Silver solder melts at around 1300 degree F, and is typically applied with a small torch. It's
primarily used for jewelry and other tasks needing a 'hard' solder. I doubt if the glass metal
seals around the filament pins of the 3-500Z would withstand that heat without fracturing. I could
be wrong...
Silver-bearing solder melts at around 700 degrees F, and is applied using our more familiar
soldering irons. This solder is used for soldering parts that have metalization 'flashed' onto
ceramic or other insulator, such as SMD parts and the famous Tektronix ceramic tie strips used in
their scopes. Plain Lead/Tin 63/37% solder will 'leach' the silver out of the flashed metalization,
loosening and finally breaking the bond. This is why Tek included small rolls of silver-bearing
solder inside their products.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Don Cunningham wrote:
On the first question, I have heard of the solder melting out of the pins on the filaments of both
the 3-500Z and the 3-400's. If that has happened to your tube, you might be able to just
re-solder it and be okay. Some have said to silver solder it, but it seems to me that silver
solder requires an awful lot of heat and I would be careful doing that.
Second question: I wouldn't think that was a good idea, but then I'm no expert, so hope Evan is
out there, hi.
73,
Don, WB5HAK
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