EL91
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BrandMullard
ClassOutput Pentode
BaseB7G
Filament6.3V @ 200mA
Construction
Primary TypePentode
EnvelopeGlass Miniature
Base MaterialGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation4 W
Grid 2 Voltage250 V
Grid 1 Voltage-100 V
Cathode Current20 mA
H-C Voltage150 V
Audio Performance
Typical THD10%
Power Output1.7 W
Key Features
- Output pentode rated for 4W anode dissipation
- Suitable for use as an r.f. or a.f. amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection | 250V | 2500 | 130000 | 12 | 16mA |
| Triode Connection (g2 connected to a) | 250V | 2700 | 4300 | 12 | 18.3mA |
Application Notes
Power output available during reproduction of speech and music. Sustained sine wave application results in approx 10% reduction in output due to bias re-adjustment.
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