EF37
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BrandMullard
ClassPentode
BaseOctal
Filament6.3V @ 0.2mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesSuitable for DC/AC operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 2 Voltage125 V
Grid 1 Voltage-0.6 V
Cathode Current6 mA
H-C Voltage100 V
Audio Performance
Typical THD1.3%
Key Features
- Low microphony
- High gain pentode
- Anti-microphonic construction
- Special construction for pre-amplifier stages
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode R.F./I.F. Amplifier | 250V | 1800 | 2500000 | - | 3mA |
| Connected as Triode | 150V | 2800 | 10000 | 28 | 6mA |
Application Notes
For use in pre-amplifier stages. Resistance of grid leak of following valve = 0.7 megohms.
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