Tube-number record
EF40
0 archive entries
EF40 is a tube type in the TubeDatabase archive (class: PENTODE). Recorded specifications: brand PHILIPS, construction Pentode, socket Rimlock, maximum plate voltage 300 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.
BrandPHILIPS
ClassPENTODE
BaseRimlock
Filament6.3 V @ 200 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; series or parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250 V | 1850 | 2500000 | 38 | 3 mA |
Application Notes
This tube can be used without special precautions against microphonic effect in amplifiers in which the input voltage Vi > 5 mV for maximum output.
Datasheets
Datasheet: EF40.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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