Tube-number record
KF 4
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BrandPhilips Miniwatt
ClassHF Pentode
BaseSide-contact (P-base)
Construction
Primary TypePentode
EnvelopeMetallized
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation0.5 W
Grid 2 Voltage150 V
Grid 1 Voltage-0.2 V
Cathode Current5 mA
Audio Performance
Key Features
- Fixed slope
- Directly heated
- Metallized bulb
- Reduced microphony
- Standard P base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF/MF Amplifier | 90 V | 700 | 1300000 | 900 | 1.2 mA |
| HF/MF Amplifier | 135 V | 800 | 1000000 | 800 | 2.6 mA |
Application Notes
Specifically designed for battery-operated 2-volt receivers. Suitable for HF or MF amplification, detection, or resistance-coupled LF amplification. The suppressor grid (g3) is brought out to a separate contact for direct grounding, which improves performance on shortwave frequencies.
Datasheets
Datasheet: KF4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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