Tube-number record
CRT74/11, CRT74/12, CRT75/O1
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CRT74/11, CRT74/12, CRT75/O1 is a tube type in the TubeDatabase archive (class: Radar Tube). Recorded specifications: brand Ferranti, construction Display / CRT, and maximum plate voltage 8000 V. The archive does not yet hold a photographed example of this type.
BrandFerranti
ClassRadar Tube
Filament4 V @ 1000 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage8000 V
Grid 2 Voltage2200 V
Grid 1 Voltage0.5 V
H-C Voltage150 V
Audio Performance
Key Features
- Radar Tube
- Electrostatic Focus
- Magnetic Deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Modulation | 5000 V | — | — | — | — |
| Cathode Modulation | 5000 V | — | — | — | — |
Application Notes
The tube is liable to screen burn at low values of scan if operated at high beam currents.
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