Tube-number record
DLL 21
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BrandPhilips
ClassOutput Pentode
BaseLoctal
Construction
Primary TypePentode
EnvelopeGlass
SectionsDouble
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage135 V
Grid 2 Voltage135 V
Audio Performance
Typical THD2.8%
Power Output0.3 W
Key Features
- Double system in one bulb
- Class B operation
- Flexible filament configuration
- Battery powered
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Push-Pull (100mA filament) | 90 V | — | — | — | — |
| Class B Push-Pull (100mA filament) | 120 V | — | — | — | — |
| Class B Push-Pull (200mA/2.8V filament) | 135 V | — | — | — |
Datasheets
Datasheet: DLL21.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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