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401ASensibly equivalent¶ to:See also:
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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: Data-sheet & 4018. Type 401A was first introduced in 1936. See also 1936 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  x1 | y1 | a2 | h,k | h | g1 | a1,a3 | y2 | x2 |
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Absolute Maximum Operating Conditions¶
CRT | Vh | Ah | Va | Vg | 
| 4.0 | 1.1 | 1,000 | -25 |
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PDF scanned from an original document held by the museum |
Updated April 07, 2015.
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