Tube-number record
21EXPA
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BrandSylvania
ClassTelevision Picture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular Glass
Sections1
Filament / Heater
Heater NotesHeater warm-up time is 11 seconds
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage600 V
Grid 1 Voltage-154 V
H-C Voltage200 V
Audio Performance
Key Features
- Direct Viewed
- Spherical Faceplate
- Gray Filter Glass
- Aluminized Screen
- Tri-Potential Electrostatic Focus
- 110° Magnetic Deflection
- No Ion Trap
- Short Neck
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Drive Service | 16000 V | — | — | — | — |
Application Notes
X-ray radiation shielding may be necessary if operated at higher than 16,000 volts.
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