Tube-number record
N31
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BrandOsram
ClassOutput Pentode
Base7-pin (non-miniature)
Filament26 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeCarbonised bulb
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated Cathode
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation8 W
Grid 2 Voltage180 V
Audio Performance
Key Features
- High mutual conductance
- High sensitivity
- Suitable for series heater strings (0.3 amp)
- Carbonised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions | 200 V | 10000 | — | — | 40 mA |
Application Notes
Specifically designed for the output stage of radio receivers or low frequency amplifiers in series-heater DC or DC-AC Universal Receivers. High sensitivity allows direct feed from diode detector.
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