EF91
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BrandPHILIPS
ClassPentode
BaseMiniature
Filament6.3V @ 0.3mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater Notesindirect by A.C. or D.C.; series or parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage150 V
Audio Performance
Key Features
- Low noise pentode
- R.F. amplifier
- Miniature construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. amplifier | 250V | 7650 | 1000000 | 70 | 10mA |
Application Notes
Designed for use as R.F. amplifier in HF circuits.
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