Tube-number record
DN41
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BrandOsram
ClassDouble Diode-Output Pentode
Base7-pin (non-miniature)
Filament4 V @ 2.3 mA
Construction
Primary TypePentode
EnvelopeGlass (carbonised)
Sections3
Filament / Heater
Heater NotesIndirectly Heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation8 W
Grid 2 Voltage250 V
Audio Performance
Key Features
- Carbonised bulb
- High sensitivity
- Common cathode for all sections
- Electrostatic screen between sections
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 250 V | 10000 | — | — | 32 mA |
Application Notes
One diode normally operates as a detector feeding into the pentode grid while the other diode produces delayed A.V.C. Grid stopper of 100,000 ohms or anode stopper of 100 ohms recommended.
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