Tube-number record
C28GS/1B, C28GS/1G, C28GS/1D (4050BB, 4050BG, 4050BD)
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BrandStandard Telephones and Cables (STC)
ClassGas Focused Cathode Ray Tube
BaseNoval (B9A)
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle Beam
Filament / Heater
MaterialOxide-coated
Absolute Maximum Ratings
Plate Voltage1500 V
Grid 1 Voltage50 V
Audio Performance
Key Features
- Blue Screen (4050BB)
- Green Screen (4050BG)
- Delay Screen (4050BD)
- Gas Focused Cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Normal Operation | 500 V | — | — | — | — |
Application Notes
For maximum life the tube should be operated with just sufficient filament current to produce a satisfactory trace. Filament current will rise with life. It is recommended that a 2,000 ohms protective resistance should be included in the shield circuit as well as in the anode circuit.
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