CL 4
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BrandPHILIPS
ClassOutput Pentode
BaseP (Side-contact)
Filament33V @ 200mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect; series supply A.C. or D.C.
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation9 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current70 mA
H-C Voltage175 V
Audio Performance
Typical THD10%
Power Output4 W
Key Features
- Indirectly heated
- Series supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A, one valve | 200V | 8000 | 35000 | - | 45mA |
| Class AB, two valves | 200V | - | - | - | 66mA |
Application Notes
This valve should only be used with automatic grid bias.
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