EL31
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BrandMullard
ClassOutput Pentode
BaseOctal
Filament6.3V @ 1.4mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialStandard
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage800 V
Plate Dissipation25 W
Grid 2 Voltage400 V
Grid 1 Voltage-1.3 V
Cathode Current200 mA
H-C Voltage100 V
Audio Performance
Typical THD13.1%
Power Output12 W
Key Features
- Anode top cap
- 25 Watt plate dissipation
- High power output up to 100W in push-pull
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Valve | 275V | 14000 | 20000 | 16.5 | 91mA |
| Single Valve | 600V | 7000 | 43000 | - | 42mA |
Application Notes
The EL31 is particularly suited for power amplifiers in push-pull stages. An anode top cap is used to permit maximum anode voltages up to 800V. For lower power, two EL37 valves in push-pull are normally used.
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