Tube-number record
CI7FM
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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 Voltage17500 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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 14000 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.
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