Tube-number record
21EP4-A
0 archive entries
21EP4-A is a tube type in the TubeDatabase archive (class: Cathode-Ray Tube). Recorded specifications: brand General Electric, year 1954, construction Magnetic focus and deflection, base Plastic, socket Duodecal, and maximum plate voltage 18000 V. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassCathode-Ray Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeMagnetic focus and deflection
EnvelopeGlass
Base MaterialPlastic
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-125 V
H-C Voltage180 V
Audio Performance
Key Features
- Gray faceplate
- Cylindrical front surface
- Ion-trap gun
- External conductive coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Television Receiver | 16000 V | — | — | — | — |
Application Notes
The electron gun is designed for use with an external single-field ion-trap magnet.
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