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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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Tube-number record

12/04 HM / 12/04 JM

0 archive entries

12/04 HM / 12/04 JM is a tube type in the TubeDatabase archive (class: Radar Display Tube). Recorded specifications: brand FERRANTI, year 1957, construction Display / CRT, base Plastic/Bakelite, socket Duodecal, and maximum plate voltage 15000 V. The archive does not yet hold a photographed example of this type.

BrandFERRANTI
ClassRadar Display Tube
BaseDuodecal
Filament6.3 V @ 300 mA

Construction

Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialPlastic/Bakelite
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
PPI Display15000 V———0.05 mA

Application Notes

The HM variant uses Orange phosphor (Type H), while the JM variant uses Blue/Yellow phosphor (Type I). The HM tube has a magnesium fluoride screen liable to burn if the spot is stationary.

Filters

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Manufacturers

Brands

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    Plate Voltage15000 V
    Grid 2 Voltage600 V
    Cathode Current0.5 mA
    H-C Voltage200 V

    Audio Performance

    Key Features
    • 12-inch diameter
    • Flat faced
    • Metal backed screen
    • Long persistence phosphor
    • Primarily for P.P.I. applications