Details
New old stock 9 pin miniature twin triode. Various brands. 5687WA is ruggedized.
NSN/FSN = 5960001794749, 5960001935136, 5960002126023 (5687WA), 5960002620173 (5687WA), 5960005773078 (5687WA), 5960006178678, 5960006859082, 5960006913753 (5687WA), 5960008000519 (5687WA), 5960008240052 (5687WA), 5960008278781 (5687WA), 5960008649837, 5960011490687, 5960013865770 (5687WB)
HP/Agilent Number = 1932-0002