4650
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BrandPhilips
ClassOutput Pentode
BaseP-Socket
Construction
Primary TypePentode
EnvelopeGlass
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage550 V
Plate Dissipation25 W
Grid 2 Voltage300 V
Grid 1 Voltage-2 V
Cathode Current100 mA
Audio Performance
Typical THD10%
Power Output10.3 W
Key Features
- Direct heating
- Parallel supply
- Power output up to 41W in AB
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 300V | 3900 | 20000 | 4.5 | 83mA |
| Class A High Voltage | 550V | 3200 | 30000 | 4.5 | 45mA |
| Class B Push-Pull | 300V | - | - | - | 30mA |
Application Notes
Operating conditions provided for Class A, AB, and B. High voltage operation up to 550V.
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