EF97
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BrandPhilips
ClassPentode
BaseMiniature
Filament6.3V @ 0.3mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesIndirect; series or parallel supply
Absolute Maximum Ratings
Plate Voltage50 V
Plate Dissipation0.5 W
Grid 2 Voltage50 V
Cathode Current15 mA
H-C Voltage50 V
Audio Performance
Key Features
- Variable mutual conductance
- Remote-cutoff
- Car radio operation
- Battery operation 6V or 12V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF/IF amplifier | 25V | 1900 | 60000 | - | 2.7mA |
| RF/IF amplifier | 12.6V | 1800 | 120000 | - | 2.5mA |
| RF/IF amplifier | 6.3V | 900 | 60000 | - | 0.8mA |
Application Notes
Designed for use as R.F. amplifier, I.F. amplifier and mixer in car radio sets.
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