Details
New old stock 9 pin miniature triode pentode. Various brands. ECF82 is the European type number. 6678 tubes are 6U8A tubes selected for mobile service (give constant output with 6.3 +/- 1.3 volts on the filament).
NSN/FSN = 5960002620243, 5960005430966, 5960005561484, 5960006650493, 5960007296963, 5960007525584, 5960007934183, 5960008494903
HP/Agilent Number = 1933-0004, 1933-0013
Tektronix Number = 154-0033-00