EEV, EMI and RCA Image orthicon Camera tubes (several). All tubes are Maintenance grade

EEV, EMI and RCA Image orthicon Camera tubes (several). All tubes are Maintenance grade, and have record cards of their usage. There are 2 off EEV 4½ ", 3 off EMI 4½ " and 1 off RCA 3". Image orthicon tubes were made in 2 sizes 3" and 4½"

Image Orthicon's were valued at and insured for £500 to £1000 each - quite a sum in 1950 - and hired and paid for per hour used. Don Brothers and Ben Palmer devised a standard method of lining up IO camera channels which was followed by all BBC London television studios in the late 1950's and used with all the new BBC Image Orthicon 4 ½" camera channels.