Tube-number record
N108
0 archive entries
N108 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Marconi, year 1952, construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 165 V, and maximum plate dissipation 9 W. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassOutput Pentode
BaseMiniature 7-pin (B7G)
Filament— V @ 0.1 mA
Construction
Primary TypePentode
EnvelopeTubular
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage165 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode | 165 V | 9500 | 23200 | 220 | 53 mA |
| Triode Connection | 165 V | 12000 | 835 | 10 | — |
| Push-pull Class AB1 Pentode | 165 V | — | — | — | 107 mA |
Application Notes
Any mounting position. Free air circulation preferable. If canister used, surfaces should be blackened.
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