EL37
3 Tubes in archive
BrandMullard
ClassOutput Pentode
BaseOctal
Filament6.3V @ 1.4mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation25 W
Grid 2 Voltage400 V
Grid 1 Voltage-1.3 V
Cathode Current200 mA
H-C Voltage75 V
Audio Performance
Typical THD10%
Power Output10.5 W
Key Features
- 25-watt pentode
- suitable for push-pull up to 69W
- suitable as driver for large power triode push-pull stages
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250V | 11000 | 13500 | 10 | 100mA |
| Triode Connected (Single Valve) | 300V | 6500 | 1400 | 9 | 50mA |
| Push-Pull (Self Bias) | 325V | - | - | - | 77mA |
Application Notes
Operating conditions provided for Pentode, Triode, and Push-Pull configurations including fixed and self-bias options.
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