I just put together a complete spare NOS tube set (14 tubes) for my
SX-111. It's interesting the manufacturers I ended up with:
Tung-Sol-(2) Sylvania-(2) RCA-(2) Westinghouse-(2)
International Raytheon Truetone PhilipsECG Coronado CBS
Together in a box, they make for an colorful pattern.
73, Skip Magnuson W7WGM