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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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LN309 vacuum tube outline illustration

Tube-number record

LN309

0 archive entries

LN309 is a tube type in the TubeDatabase archive (class: Triode-Pentode). Recorded specifications: brand Marconi, year 1952, construction Multi-section, base Glass, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 5.4 W. The archive does not yet hold a photographed example of this type.

BrandMarconi
ClassTriode-Pentode
BaseNoval (B9A)
Filament12.6 V @ 0.3 mA

Construction

Primary TypeMulti-section
EnvelopeTubular
Base MaterialGlass
Sections2

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode System Class A165 V470045000—32 mA
Triode System Class A165 V220077001711 mA
Pentode Push-Pull Class AB1165 V———46 mA

Application Notes

Suitable for audio output, frame output, and sync separator in broadcast receivers and television sets.

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Plate Voltage250 V
    Plate Dissipation5.4 W
    Grid 2 Voltage250 V
    H-C Voltage150 V

    Audio Performance

    Typical THD10%
    Power Output2.1 W
    Key Features
    • Separate cathodes for triode and pentode
    • No internal screening