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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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12/02 HM vacuum tube outline illustration

Tube-number record

12/02 HM

0 archive entries

12/02 HM is a tube type in the TubeDatabase archive (class: Radar Display Tube). Recorded specifications: brand FERRANTI, year 1957, construction Display / CRT, socket Octal, and maximum plate voltage 13000 V. The archive does not yet hold a photographed example of this type.

BrandFERRANTI
ClassRadar Display Tube
BaseOctal
Filament4 V @ 900 mA

Construction

Primary TypeDisplay / CRT
Envelope12in diameter flat faced
Sections1

Filament / Heater

Absolute Maximum Ratings

Plate Voltage13000 V
Grid 2 Voltage2200 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Radar Display12000 V———0.05 mA

Application Notes

The screen material is liable to burn if operated with a spot which is stationary or slow moving. The tube should not be operated under such conditions even at low beam current.

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    H-C Voltage150 V

    Audio Performance

    Key Features
    • Metal backed screen
    • Long persistence fluoride screen
    • Electrostatic focus
    • Magnetic deflection