21AWP4A
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BrandRCA
ClassPicture Tube
BaseDuodecal 5-Pin
Filament6.3V @ 600mA
Construction
Primary TypeRectangular Glass
EnvelopeGlass
Base MaterialSmall-Shell
SectionsSingle
Filament / Heater
MaterialP4-Sulfide Type, Aluminized
Warm-up Time11s
Heater NotesTolerance ± 30 mA
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage550 V
Grid 1 Voltage-155 V
H-C Voltage200 V
Audio Performance
Key Features
- No ion-trap magnet required
- Aluminized screen
- Magnetic focus
- 72° Magnetic deflection
- Filterglass faceplate
- Rectangular glass type
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode-Drive Service | 18000V | - | - | - | - |
Application Notes
Surface of protective window treated to reduce specular reflection. Grid No. 1 circuit resistance 1.5 max megohms.
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