DL33
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BrandMullard
ClassOutput Pentode
BaseOctal
Construction
Primary Typepentode
EnvelopeGlass
Base MaterialPlastic
Sectionssingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage110 V
Grid 2 Voltage110 V
Cathode Current6 mA
Audio Performance
Typical THD6%
Power Output0.4 W
Key Features
- Centre-tapped filament
- Battery operated equipment
- Class A Amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Series Filament 90V | 90V | 2000 | 80000 | - | 8mA |
| Series Filament 110V | 110V | 2000 | 110000 | - | 8.5mA |
| Parallel Filament 85V | 85V | 1950 | 70000 | - | 7mA |
| Parallel Filament 90V | 90V | 2200 | 90000 | - | 9.5mA |
| Parallel Filament 110V | 110V | 2200 | 100000 | - | 10mA |
Application Notes
Max cathode current is 6mA for each 1.4V filament section.
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