KF1
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BrandPhilips Miniwatt
ClassH.F. Pentode
Base5-pin European
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage135 V
Grid 2 Voltage135 V
Audio Performance
Key Features
- H.F.- and Z.F.-Amplifier
- Low Anode-Grid capacitance
- Battery operation
- High amplification at low voltages
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. Amplifier (High Voltage) | 135V | 1800 | 900000 | 1600 | 3mA |
| H.F. Amplifier (Low Voltage) | 90V | 1000 | 1500000 | 1500 | 1.1mA |
Application Notes
Recommended for use as an H.F. or Z.F. amplifier. Use as an audio amplifier or detector is only recommended if the speaker is external to avoid microphonic effects.
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