Heater rated at 0,85 to 1,0A at 0,5 to 0,6V.
Normally supplied from 4V via a 4 ohm resistor.
HT minimum of 180V.
Probably the first cathode ray "magic eye" tube.
The design by STC was based on an STC cathode ray tube.
Two methods of use were suggested:
a) HF/IF anode current fed via suiable network.
b) HF/IF signal applied directly to the grid to produce a straight line with a length in proportion to signal strenth.
