EF 89
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BrandPhilips
ClassPentode
BaseNoval
Filament6.3V @ 200mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating, AC or DC; parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.25 W
Grid 2 Voltage300 V
Cathode Current16.5 mA
H-C Voltage100 V
Audio Performance
Key Features
- Variable mutual conductance
- R.F. amplifier
- I.F. amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical characteristics 1 | 250V | 3600 | 900000 | - | 9mA |
| Typical characteristics 2 | 250V | 4000 | 750000 | 21 | 9mA |
| Typical characteristics 3 | 170V | 4400 | 400000 | - | 12mA |
Application Notes
Pentode with variable mutual conductance for use as RF or IF amplifier. If grid current occurs, negative grid bias should be increased to at least 1.5V.
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