Tube-number record
21DLP4
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BrandRadio Corporation of America
ClassPicture Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialPlastic
Sections1
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage500 V
Grid 1 Voltage-140 V
H-C Voltage180 V
Audio Performance
Key Features
- Aluminized screen
- Rectangular faceplate
- Low-voltage electrostatic focus
- Magnetic deflection
- Spherical faceplate
- Filterglass faceplate
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid-Drive Service | 16000 V | — | — | — | — |
Application Notes
The 21DLP4 is a 90-degree glass picture tube requiring no ion-trap magnet. It features a short overall length and a wide-angle deflection system.
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