EF93
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BrandMullard
ClassVariable-mu pentode
BaseB7G
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
Plate Dissipation3 W
Grid 2 Voltage300 V
Cathode Current18 mA
H-C Voltage90 V
Audio Performance
Key Features
- Variable-mu
- R.F. amplifier
- I.F. amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation 1 | 100V | 4300 | 250000 | - | 10.8mA |
| Operation 2 | 250V | 4400 | 1500000 | - | 11mA |
Application Notes
Variable-mu pentode for use as r.f. or i.f. amplifier.
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