Tube-number record
EF9
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BrandPHILIPS
ClassPENTODE
BaseSide-contact (P-base)
Filament6.3 V @ 200 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater Notesindirect; series or parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2 W
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current10 mA
H-C Voltage100 V
Audio Performance
Typical THD2.7%
Power Output0.05 W
Key Features
- Variable mutual conductance
- R.F. amplifier
- I.F. amplifier
- A.F. amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. or I.F. amplifier | 100 V | 2200 | 400000 | — | 6 mA |
| R.F. or I.F. amplifier | 200 V | 2200 | 900000 | — | 6 mA |
| R.F. or I.F. amplifier | 250 V | 2200 | 1200000 | — | 6 mA |
Application Notes
This tube can be used without special precautions against microphonic effect in circuits in which the input voltage Vi > 10 mV for an output of 50mW.
Datasheets
Datasheet: EF9.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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