CF50
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BrandPhilips
ClassPentode
BaseSide-contact (P-base)
Filament30V @ 0.2mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; series or parallel supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1 W
Grid 2 Voltage125 V
Grid 1 Voltage-1.3 V
Cathode Current10 mA
H-C Voltage100 V
Audio Performance
Typical THD0.2%
Key Features
- Low noise microphone pre-amplifier
- Indirectly heated
- Series or parallel supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical characteristics (Condition 1) | 100V | 3300 | 2000000 | 45 | 1.5mA |
| Typical characteristics (Condition 2) | 250V | 3300 | 2500000 | 45 | 1.5mA |
Application Notes
Operating conditions as resistance-coupled L.F. amplifier provided for various supply voltages up to 450V.
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