Tube-number record
21AMP4, 21AMP4A
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BrandTung-Sol
ClassCathode Ray Picture Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular Glass
Sections1
Filament / Heater
Heater NotesIndirectly Heated
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
H-C Voltage180 V
Audio Performance
Key Features
- Magnetic Focus
- Magnetic Deflection
- External Single Field Ion Trap
- Spherical Grey Filter Faceplate
- Metal-backed screen (21AMP4A only)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 16000 V | — | — | — | — |
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