Details
New old stock ruggedized 9 pin miniature twin triode. Various brands.
NSN/FSN = 5960000546869 (6189W), 5960000824115, 5960001034120 (6189W), 5960001074214 (6189W), 5960001346012 (6189W), 5960006362218, 5960006427557, 5960006809685 (6189W), 5960007293134 (6189W), 5960007835503, 5960007918756, 5960008385922 (6189W), 5960008462524, 5960008471617, 5960008782511, 5960008940126, 5960008964208 (6189W)
Tektronix Number = 154-0287-00