Tube-number record
EF39
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BrandPHILIPS
ClassPENTODE
BaseOctal
Filament6.3 V @ 0.2 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
Key Features
- Variable mutual conductance
- Resistance coupling support
- Low microphonic effect
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF/IF Amplifier | 250 V | 2200 | 1200000 | — | 6 mA |
| AF Amplifier (Mode A) | 250 V | 106 | — | — | 0.87 mA |
| AF Amplifier (Mode B) | 250 V | 85 | — | — | 1.6 mA |
Application Notes
Can be used without special precautions against microphonic effect in circuits where input voltage is >= 10 mV for an output of 50 mW.
Datasheets
Datasheet: EF39.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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