Tube-number record
21ASP4
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BrandTung-Sol
ClassCathode Ray Picture Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeRectangular Glass
EnvelopeGlass
Base MaterialPlastic
Sections1
Filament / Heater
Heater NotesUnipotential cathode
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-125 V
H-C Voltage180 V
Audio Performance
Key Features
- Magnetic deflection
- Electrostatic focus
- Spherical faceplate
- Grey filter faceplate
- External single field ion trap
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Direct-view monochrome television | 16000 V | — | — | — | 0.1 mA |
Application Notes
The 21ASP4 is identical to the 21XP4 in all respects except that the external conductive coating is not applied.
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