KL4
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BrandPhilips
ClassOutput Pentode
BaseSide-contact
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage135 V
Plate Dissipation1 W
Grid 2 Voltage135 V
Grid 1 Voltage-0.2 V
Cathode Current10 mA
Audio Performance
Typical THD10%
Power Output0.8 W
Key Features
- Directly heated battery tube
- Parallel supply possible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A (90V) | 90V | 1800 | 150000 | 13 | 4.7mA |
| Class A (135V) | 135V | 2100 | 130000 | 13 | 7mA |
| Class B (135V) | 135V | - | - | - | 9.8mA |
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