[quote author="dejacky"] Is there a particular brand/type/guage you'd recommend?
[/quote]
Solders (Sn-Pb alloys) can have regulated melting point by some
other metall, which is compuunded.
Bismuth (Bi) usually shifts melting point low,
Silver (Ag) usually shifts melting point up.
For power tube socket, silver solder can be improvement,
For small tube, it is not significant. You can use normal eutectic
solder (63 percent Sn, Pb).
For semiconductor soldering, Bismuth solder is good.
Note for you: When solder tube socket, do it with some
old tube plugged
xvlk