EF71
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BrandMullard
ClassSubminiature Variable-mu R.F. Pentode
BaseB8D/F
Filament6.3V @ 150mA
Construction
Primary Typepentode
Envelopesubminiature
Sectionssingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage175 V
Plate Dissipation1 W
Grid 2 Voltage175 V
Cathode Current10 mA
H-C Voltage100 V
Audio Performance
Key Features
- Subminiature
- Variable-mu
- R.F. Pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| controlled r.f. amplifier | 100V | 4500 | 260000 | - | - |
Application Notes
Variable-mu pentode suitable for use in controlled r.f. amplifiers. Direct soldered connections to the leads must be at least 5mm from the seal and any bending of the valve leads must be at least 1.5mm from the seal.
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