Tube-number record
EF5
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BrandPhilips Miniwatt
ClassH.F. Pentode
BaseSide-contact (P-base)
Filament6.3 V @ 200 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating
Absolute Maximum Ratings
Plate Voltage250 V
H-C Voltage75 V
Audio Performance
Key Features
- H.F. Penthode-Selectode
- High gain
- Low inter-electrode capacitance
- Variable-mu (Selectode)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Vg2 = 100V | 250 V | 1700 | 1200000 | 2000 | 8 mA |
| Vg2 = 85V | 250 V | 1850 | 1200000 | 2200 | 7.5 mA |
| Vg2 = 60V | 250 V | 1400 | 1400000 | 2000 | 4 mA |
Application Notes
Specifically designed for H.F. and M.F. amplification with automatic gain control (AGC). Suitable for shortwave reception due to high impedance and low capacitance.
Datasheets
Datasheet: EF5.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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