Tube-number record
21CXP4
0 archive entries
21CXP4 is a tube type in the TubeDatabase archive (class: Cathode-Ray Tube). Recorded specifications: brand The Rauland Corporation, year 1957, construction Display / CRT, base Small Shell Duodecal, socket Duodecal, and maximum plate voltage 22000 V. The archive does not yet hold a photographed example of this type.
BrandThe Rauland Corporation
ClassCathode-Ray Tube
BaseDuodecal
Filament6.3 V @ 0.64 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGray Filter Glass
Base MaterialSmall Shell Duodecal
SectionsSingle
Filament / Heater
Heater Notes0.64 +/- 10% amperes
Absolute Maximum Ratings
Plate Voltage22000 V
Grid 2 Voltage70 V
Grid 1 Voltage150 V
H-C Voltage200 V
Audio Performance
Key Features
- Electrostatic focus
- Magnetic deflection
- Direct-view picture tube
- No external ion trap magnet required
- Metal-backed screen
- External conductive coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode Drive | 18000 V | — | — | — | — |
Application Notes
Specifically intended for cathode drive television applications. External conductive coating serves as filter capacitor when grounded.
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