Tube-number record
DISPLAY TUBE
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BrandFerranti
ClassRadar Tube
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular faced
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage70 V
Grid 1 Voltage-500 V
H-C Voltage200 V
Audio Performance
Key Features
- Miniaturised rectangular face
- Designed for transistor circuitry
- Low scan power
- High modulation slope
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Short grid base | 15000 V | — | — | — | 0.15 mA |
| High brightness applications | 15000 V | — | — | — | 2.5 mA |
Application Notes
All potentials are referred to grid. Tube is inefficient under grid modulation unless drive is also applied to A3.
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