DAF70
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BrandMullard
ClassSubminiature A.F. Pentode and Single Diode
BaseB8D/F
Construction
Primary TypePentode
Rectifier TypeSingle Diode
EnvelopeSubminiature
Base MaterialGlass
SectionsCombined Diode-Pentode
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage90 V
Cathode Current1.3 mA
Audio Performance
Typical THD10%
Power Output0.02 W
Key Features
- Subminiature construction
- Directly heated filament
- Battery operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | 67.5V | 440 | 400000 | 16 | 1mA |
| Class A (67.5V) | 67.5V | - | - | - | 0.4mA |
| Class A (90V) | 90V | - | - | - | 0.6mA |
Application Notes
Direct soldered connections to leads must be at least 5mm from the seal. Any bending of leads must be at least 1.5mm from the seal.
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