Tube-number record
21ALP4
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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 NotesHeater current 0.6A ± 10%
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-125 V
H-C Voltage180 V
Audio Performance
Key Features
- 21-Inch Rectangular Glass
- Low-Voltage Electrostatic Focus
- 90-Degree Deflection Angle
- Gray Faceplate
- Ion-Trap Gun
- External Conductive Coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Television Application | 16000 V | — | — | — | — |
Application Notes
Anode, grid-No. 3 and grid-No. 5 are connected together. If operated above 16,000 volts, x-ray radiation shielding may be necessary.
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