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

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CI7FM vacuum tube outline illustration

Tube-number record

CI7FM

0 archive entries

CI7FM is a tube type in the TubeDatabase archive (class: Teletube (CRT)). Recorded specifications: brand BRIMAR, construction Other / special, socket Duodecal, and maximum plate voltage 17500 V. The archive does not yet hold a photographed example of this type.

BrandBRIMAR
ClassTeletube (CRT)
BaseDuodecal
Filament12.6 V @ 300 mA

Construction

Primary TypeOther / special
EnvelopeRectangular
SectionsTetrode gun

Filament / Heater

Heater NotesUnder series operated conditions, the maximum heater voltage must not exceed 15 volts R.M.S.

Absolute Maximum Ratings

Plate Voltage

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical14000 V———0.05 mA

Application Notes

The ion-trap magnet should be adjusted for optimum brightness. Incorrect positioning may lead to premature failure of the tube. Max heater voltage during series operation should be managed with a Brimistor.

Filters

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Manufacturers

Brands

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    17500 V
    Grid 2 Voltage410 V
    Grid 1 Voltage-2 V
    Cathode Current0.25 mA
    H-C Voltage150 V

    Audio Performance

    Key Features
    • Tetrode gun
    • Ion trap
    • Aluminized screen
    • External conductive coating