Tube-number record
21AQP4, 21AQP4A
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BrandTung-Sol
ClassCathode Ray Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialSmall Shell Duodecal 5-Pin
Sections1
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
H-C Voltage180 V
Audio Performance
Key Features
- Rectangular glass construction
- Spherical grey filter faceplate
- External single field ion trap
- Metal-backed screen on 21AQP4A
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 16000 V | — | — | — | — |
Application Notes
Direct view picture tubes designed for use in television applications. 21AQP4A is aluminized.
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