EF 42
0 Tubes in archive
BrandPHILIPS
ClassR.F. PENTODE
BaseRIMLOCK
Filament6.3V @ 0.33mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3.5 W
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current25 mA
H-C Voltage100 V
Audio Performance
Key Features
- Wide-band amplifier
- Indirectly heated
- Parallel supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Wide-band amplifier | 250V | 9000 | 500000 | 85 | 10mA |
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