Tube-number record
E702A/E702E
0 archive entries
E702A/E702E is a tube type in the TubeDatabase archive (class: Direct View Storage Tube). Recorded specifications: brand English Electric Valve Company Ltd, construction Display / CRT, socket 31-pin button, and maximum plate voltage 12000 V. The archive does not yet hold a photographed example of this type.
BrandEnglish Electric Valve Company Ltd
ClassDirect View Storage Tube
Base31-pin button
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsTwo electron guns (Writing and Flood)
Filament / Heater
Heater NotesIndirectly heated oxide coated cathodes for both guns.
Absolute Maximum Ratings
Plate Voltage12000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Writing Gun | -2300 V | — | — | — | 0.55 mA |
| Flood Gun | 8000 V | — | — | — | 1.5 mA |
Application Notes
The E702E is selected for improved uniformity of erasure. Magnetic shielding is essential due to the low voltage of the flood gun beam. The tube should be transported screen upwards to prevent particles falling on storage elements.
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