Tube-number record
21BCP4
0 archive entries
21BCP4 is a tube type in the TubeDatabase archive (class: Cathode-Ray Tube). Recorded specifications: brand General Electric, year 1955, construction Rectangular Glass, 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 TypeRectangular Glass
EnvelopeGlass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-125 V
H-C Voltage410 V
Audio Performance
Key Features
- No ion-trap magnet required
- Aluminized screen
- Gray faceplate
- External conductive coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 16000 V | — | — | — | — |
Application Notes
The 21BCP4 is a rectangular all-glass picture tube for direct-view television reception. It employs electrostatic focusing and magnetic deflection. High-quality fluorescent screen is aluminized to increase light output.
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