Tube-number record
EFM1
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EFM1 is a tube type in the TubeDatabase archive (class: L.F. Pentode / Tuning Indicator). Recorded specifications: brand Philips, construction Pentode, maximum plate voltage 300 V, and maximum plate dissipation 0.4 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassL.F. Pentode / Tuning Indicator
Filament6.3 V @ 200 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsPentode-Indicator
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; Parallel or series supply
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| L.F. Amplifier / Tuning Indicator (Min Bias) | 146 V | — | — | 60 | 0.8 mA |
| L.F. Amplifier / Tuning Indicator (Max Bias) | 165 V | — | — | 13 | 0.5 mA |
Application Notes
Operating characteristics specified for L.F. amplifier use with tuning indication.
Datasheets
Datasheet: EFM1.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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