DL 21
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BrandPhilips
ClassOutput Pentode
BaseLoctal (B8G)
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Glass
Sections1
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage135 V
Plate Dissipation0.7 W
Grid 2 Voltage135 V
Cathode Current7 mA
Audio Performance
Typical THD10%
Power Output0.26 W
Key Features
- Battery operated
- Low filament current
- High efficiency (47%)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-ended Class A | 90V | 1300 | 300000 | - | 4mA |
| Single-ended Class A | 120V | 1400 | 350000 | - | 5mA |
Application Notes
The DL 21 is designed for use as an output tube in battery-operated receivers with very low filament current. To avoid hum in series filament circuits, place the DL 21 at the negative end of the chain.
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