Tube-number record
4050-AB
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BrandStandard Valves
ClassGas Filled Cathode Ray Tube
BaseNoval (B9A)
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Filament / Heater
Absolute Maximum Ratings
Plate Voltage2000 V
Audio Performance
Key Features
- Blue spot screen for photographic work
- Standard British 9-pin base
- Gas-filled for high sensitivity
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Normal Operation | 350 V | 1 | — | — | — |
Application Notes
A 2,000 ohm protective resistance should be included in the shield circuit as well as in the anode circuit. The PX plates produce horizontal deflection when the tube is mounted with pins 4 and 5 at the bottom.
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