DF66
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BrandMullard
ClassSubminiature A.F. Voltage Amplifying Pentode
BaseB5A
Construction
Primary TypePentode
EnvelopeSubminiature
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage45 V
Grid 2 Voltage45 V
Cathode Current0.1 mA
Audio Performance
Key Features
- Low filament current (15 mA)
- Hearing-aid intended
- H.T. battery supply 22.5 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | 22.5V | 100 | 2000000 | 11.5 | 0.05mA |
Application Notes
Subminiature voltage amplifying pentode primarily intended for use with an H.T. battery supply of 22.5 volts in hearing-aids. Direct soldered connections to the leads must be at least 5 mm from the seal.
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