1T4
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BrandBrimar
ClassRF Pentode
BaseB7G
Construction
Primary TypePentode
EnvelopeMiniature
SectionsSingle
Filament / Heater
MaterialOxide Coated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current5.5 mA
Audio Performance
Key Features
- Miniature Vari-mu
- Battery RF Pentode
- Internal screening
- High gain audio amplifier capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF/IF Amplifier | 45V | 700 | 350000 | - | 1.7mA |
| RF/IF Amplifier | 90V | 750 | 800000 | - | 1.8mA |
| RF/IF Amplifier | 90V | 900 | 500000 | - | 3.5mA |
Application Notes
Suitable for R.F. or I.F. stages of receivers employing A.V.C. and for high gain amplifiers in deaf aids.
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