EFM1
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BrandPhilips
ClassL.F. Pentode / Tuning Indicator
Filament6.3V @ 200mA
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
Plate Dissipation0.4 W
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current5 mA
H-C Voltage100 V
Audio Performance
Typical THD2%
Key Features
- Indirectly heated
- Combined L.F. Pentode and Tuning Indicator
- Parallel or series supply compatible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| L.F. Amplifier / Tuning Indicator (Min Bias) | 146V | - | - | 60 | 0.8mA |
| L.F. Amplifier / Tuning Indicator (Max Bias) | 165V | - | - | 13 | 0.5mA |
Application Notes
Operating characteristics specified for L.F. amplifier use with tuning indication.
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