CBL1
0 Tubes in archive
BrandPhilips
ClassDouble diode output pentode
BaseP
Filament44V @ 200mA
Construction
Primary TypeDouble diode output pentode
EnvelopeGlass
Base MaterialMetal/Glass
SectionsTri-section (2 diodes, 1 pentode)
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; series supply
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 Output0.85 W
Key Features
- Indirectly heated
- Double diode pentode combination
- Automatic or semi-automatic bias only
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 100V | 6500 | 48000 | 14 | 21mA |
| Class A | 200V | 8000 | 40000 | 13.5 | 45mA |
Application Notes
The tube should only be used with automatic or semi-automatic bias. In order to avoid excessive hum the gain between the detection diode and the pentode grid should not exceed 15.
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