21ERPA
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BrandSylvania
ClassTelevision Picture Tube
BaseB7-208
Filament6.3V @ 600mA
Construction
Primary TypeRectangular Glass
EnvelopeJ171H or J171I
Sections1
Filament / Heater
Heater NotesHeater warm-up time: 11 seconds
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage700 V
Grid 1 Voltage-154 V
H-C Voltage200 V
Audio Performance
Key Features
- Direct Viewed
- Spherical Faceplate
- Integral Safety Plate
- Gray Filter Glass
- Frosted Face
- Aluminized Screen
- No Ion Trap
- Short Neck
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Drive Service | 16000V | - | - | - | - |
Application Notes
X-ray radiation shielding may be necessary if operated at higher than the manufacturer's Maximum Rated Anode Voltage or 16,000 volts, whichever is less. Integral safety plate laminated directly to face of tube.
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