EF50
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BrandMullard
ClassR.F. Pentode
BaseB9G
Filament6.3V @ 300mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesSuitable for series or parallel operation a.c. or d.c.
Absolute Maximum Ratings
Plate Voltage300 V
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage100 V
Audio Performance
Key Features
- Single-ended
- High slope
- Fully controlled by voltages 0 to -6V or 0 to -55V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier | 250V | 6500 | 1000000 | - | 10mA |
| RF Amplifier (A.G.C.) | 250V | 6500 | 1000000 | - | 10mA |
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