EL81
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BrandPhilips
ClassOutput Pentode
BaseNoval with Top Cap
Filament6.3V @ -mA
Construction
Primary TypePentode
EnvelopeGlass
Filament / Heater
Heater NotesMeasured at 6.15V to 6.45V in circuit
Absolute Maximum Ratings
Plate Voltage315 V
Grid 2 Voltage159 V
Audio Performance
Power Output40 W
Key Features
- Used in EL 6411 amplifier
- Parallel push-pull configuration
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Idle (Nullast) | 306V | - | - | - | 17.5mA |
| Full Load (Vollast) | 271V | - | - | - | 68mA |
Application Notes
The EL81 is used in a quad arrangement (B5, B6, B7, B8) for the power stage of the EL 6411 amplifier.
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