Tube-number record
EF9
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EF9 is a tube type in the TubeDatabase archive (class: PENTODE). Recorded specifications: brand PHILIPS, construction Pentode, socket Side-contact (P-base), maximum plate voltage 300 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
BrandPHILIPS
ClassPENTODE
BaseSide-contact (P-base)
Filament6.3 V @ 200 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater Notesindirect; series or parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. or I.F. amplifier | 100 V | 2200 | 400000 | — | 6 mA |
| R.F. or I.F. amplifier | 200 V | 2200 | 900000 | — | 6 mA |
| R.F. or I.F. amplifier | 250 V | 2200 | 1200000 | — | 6 mA |
Application Notes
This tube can be used without special precautions against microphonic effect in circuits in which the input voltage Vi > 10 mV for an output of 50mW.
Datasheets
Datasheet: EF9.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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