T921
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BrandEnglish Electric Valve
ClassCathode Ray Tube
BaseInternational Octal B.S.448/B8-0
Filament6.3V @ 1100mA
Construction
Primary TypeElectrostatic focus, magnetic deflection
Envelope9-inch diameter, aluminium backed screen
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated, Oxide Coated
Absolute Maximum Ratings
Plate Voltage13000 V
Grid 2 Voltage2150 V
Grid 1 Voltage-200 V
H-C Voltage125 V
Audio Performance
Key Features
- Electrostatic focus
- Magnetic deflection
- Aluminium backed screen
- Orange afterglow
- Very long persistence
- High beam current delivery
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condition 1 | 8000V | - | - | - | - |
| Condition 2 | 12000V | - | - | - | - |
Application Notes
Designed for radar applications. The fluoride screen is sensitive to burn and should not be operated with slow moving spots. Anode 1 must be at least 50 volts positive with respect to anode 2 to prevent secondary electrons reaching the screen.
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