Details
New old stock 7 pin miniature sharp cutoff pentode. Various brands. EF94 is the European designation.
NSN/FSN = 5960005561328, 5960006174920, 5960009967077, 5960001667676, 5960000820038, 5960008920795 (matched), 5960004643375, 5960000884341 (matched), 5960008269247
HP/Agilent Number = 1923-0069
Tektronix Number = 154-0022-00, 157-0059-00 (matched)