Tube-number record
N43
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BrandOsram
ClassScreened Output Pentode
Filament4 V @ 2 mA
Construction
Primary TypePentode
EnvelopeGlass
Base Material7-pin
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated Cathode
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation10 W
Grid 2 Voltage250 V
Audio Performance
Key Features
- High sensitivity
- Large undistorted power output
- Low value of interelectrode capacity
- Top cap grid connection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Condition 1 | 250 V | 10000 | — | — | 40 mA |
| Pentode Condition 2 | 250 V | 10000 | — | — | 32 mA |
Application Notes
Owing to the high sensitivity a grid stopping resistance is recommended, but the total resistance in the grid circuit should in no case exceed 500,000 ohms. Type N43 should only be employed with full automatic grid bias.
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