Tube-number record
C28GS/1B, C28GS/1G, C28GS/1D (4050BB, 4050BG, 4050BD)
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C28GS/1B, C28GS/1G, C28GS/1D (4050BB, 4050BG, 4050BD) is a tube type in the TubeDatabase archive (class: Gas Focused Cathode Ray Tube). Recorded specifications: brand Standard Telephones and Cables (STC), construction Display / CRT, socket Noval (B9A), and maximum plate voltage 1500 V. The archive does not yet hold a photographed example of this type.
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
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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