EF40
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BrandPHILIPS
ClassPENTODE
BaseRimlock
Filament6.3V @ 200mA
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
Plate Dissipation1 W
Grid 2 Voltage200 V
Grid 1 Voltage-1.3 V
Cathode Current6 mA
H-C Voltage100 V
Audio Performance
Key Features
- Low microphonic effect
- A.F. amplifier use
- Indirectly heated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250V | 1850 | 2500000 | 38 | 3mA |
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.
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