Tube-number record
21BNP4
0 archive entries
21BNP4 is a tube type in the TubeDatabase archive (class: Cathode-Ray Tube). Recorded specifications: brand General Electric, year 1955, construction Display / CRT, 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 TypeDisplay / CRT
EnvelopeGlass
Base MaterialPlastic
Sections1
Filament / Heater
Heater NotesHeater current: 0.6 Amperes +/- 10%
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-125 V
H-C Voltage180 V
Audio Performance
Key Features
- No ion-trap magnet required
- Aluminized screen
- Gray faceplate
- Electrostatic focusing
- External conductive coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 16000 V | — | — | — | — |
Application Notes
The center of the focusing range is designed to fall at or near the value of B+ voltage normally encountered in television receivers. Requires no ion-trap magnet.
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