Tube-number record
N43
0 archive entries
N43 is a tube type in the TubeDatabase archive (class: Screened Output Pentode). Recorded specifications: brand Osram, construction Pentode, base 7-pin, maximum plate voltage 250 V, and maximum plate dissipation 10 W. The archive does not yet hold a photographed example of this type.
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
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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