EL 51
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BrandPhilips
ClassOutput Pentode
BaseP
Filament6.3V @ 1900mA
Construction
Primary TypePentode
SectionsSingle
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; parallel supply
Absolute Maximum Ratings
Plate Voltage750 V
Plate Dissipation45 W
Grid 2 Voltage750 V
Grid 1 Voltage-1.3 V
Cathode Current200 mA
H-C Voltage50 V
Audio Performance
Typical THD5%
Power Output140 W
Key Features
- Indirectly heated
- High power output
- Side-contact base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Characteristic 1 | 500V | 14000 | 33000 | 16.5 | 87mA |
| Typical Characteristic 2 | 750V | 8000 | 50000 | 16.5 | 60mA |
| Class B Push-Pull | 750V | - | - | - | 145mA |
| Class AB Push-Pull | 500V | - | - | - | 110mA |
Application Notes
Suitable for Class B and Class AB push-pull audio output stages.
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