Tube-number record
OUTPUT PENTODE
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BrandPhilips
ClassAudio Power Tube
BaseSide-contact (P-base)
Filament6.3 V @ 1 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialSide-contact
Sections1
Filament / Heater
Heater NotesIndirect heating by A.C.; parallel supply
Absolute Maximum Ratings
Plate Voltage425 V
Plate Dissipation18 W
Grid 2 Voltage425 V
Grid 1 Voltage-1.3 V
Cathode Current90 mA
H-C Voltage50 V
Audio Performance
Typical THD10%
Power Output8 W
Key Features
- Indirectly heated
- Parallel supply
- Side-contact base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode | 250 V | 14500 | 20000 | 20 | 72 mA |
| Class AB Pentode | 425 V | — | — | — | 46 mA |
| Class A Triode Connection | 375 V | — | — | — | 50 mA |
Application Notes
Output pentode for audio amplification in class A or class AB push-pull stages.
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