DF91
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BrandMullard
ClassPentode
BaseB7G
Construction
Primary TypeVariable-mu pentode
EnvelopeMiniature
SectionsSingle
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current5.5 mA
Audio Performance
Key Features
- Miniature
- Variable-mu
- D.C. filament operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. or I.F. amplifier 1 | 45V | 700 | 350000 | - | 1.7mA |
| R.F. or I.F. amplifier 2 | 67.5V | 875 | 250000 | - | 3.4mA |
| R.F. or I.F. amplifier 3 | 90V | 750 | 800000 | - | 1.8mA |
| R.F. or I.F. amplifier 4 | 90V | 900 | 500000 | - | 3.5mA |
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