Tube-number record
EF71
0 archive entries
EF71 is a tube type in the TubeDatabase archive (class: Subminiature Variable-mu R.F. Pentode). Recorded specifications: brand Mullard, construction Pentode, socket B8D / B8F, maximum plate voltage 175 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.
BrandMullard
ClassSubminiature Variable-mu R.F. Pentode
BaseB8D / B8F
Filament6.3 V @ 150 mA
Construction
Primary TypePentode
Envelopesubminiature
Sectionssingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage175 V
Plate Dissipation1 W
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| controlled r.f. amplifier | 100 V | 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.
Datasheets
Datasheet: EF71.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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