The KU-618 is a grid glow tube which is neon gas filled and made by Westinghouse for use in projection equipment. Its base had very heavy pins in the "thyratron" configuration. Each tube seemed to be serial numbered.
Length = 5.50" Diameter = 2.00"
Max crest anode current = .1 amp
Cold cathode maximum average anode current = .013 amp GOTO INDEX