Tube-number record
21XP4-A
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BrandGeneral Electric
ClassCathode-Ray Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialSmall-shell Duodecal
Sections1
Filament / Heater
Heater Notes0.6 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
- Low voltage electrostatic focus
- Magnetic deflection
- 70-degree deflection angle
- Aluminized screen
- Ion-trap gun
- Gray faceplate
- External conductive coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 16000 V | — | — | — | — |
Application Notes
Anode, grid-No. 3 and grid-No. 5 which are connected together within the tube are referred to herein as anode. Focusing electrode voltage range -0.4 to +2.2 percent of anode voltage.
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