Sensibly equivalent¶ to:
This 401A small CRT from GEC still carries the experimental type designation of E4103/B/4. The face is sensibly flat for 30 mm diameter.
Both anodes are connected together and need 1000 Volts on them. With 1000 Volts on the anodes the Y sensitivity is 0.09 mm/V and the X sensitivity is 0.1 mm/V. The grid voltage of -25 Volts is to achieve cut-off. The screen has a green trace.
The detail picture shows the electron gun and Y deflection plates.
The end window envelope is 37 mm in diameter, and excluding the B9 base pins, is 143 mm tall.
References: Datasheet & 4018. Type 401A was first introduced in 1936.
Absolute Maximum Operating Conditions¶
PDF scanned from an original document held by the museum
Updated April 07, 2015. shape:end.window construction:pinch type:cathode-ray.tube age:1930.1940 base:b9 heater:4.0v pins:9 pin:1.x1 pin:2.y1 pin:3.a2 pin:4.h.k pin:5.h pin:6.g1 pin:7.a1.a3 pin:8.y2 pin:9.x2