Tube-number record
21XP4B
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21XP4B is a tube type in the TubeDatabase archive (class: Picture Tube). Recorded specifications: brand RCA, year 1965, construction Display / CRT, socket Duodecal, and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassPicture Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Sections1
Filament / Heater
Heater Notes600 +/- 30 mA
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage550 V
Grid 1 Voltage-155 V
H-C Voltage200 V
Audio Performance
Key Features
- Low-voltage electrostatic focus
- No ion-trap magnet required
- Aluminized phosphor
- Filterglass faceplate
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid-Drive Service | 16000 V | — | — | — | — |
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