LN309
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BrandMarconi
ClassTriode-Pentode
BaseB9A
Filament12.6V @ 0.3mA
Construction
Primary TypeTriode-Pentode
EnvelopeTubular
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode System Class A | 165V | 4700 | 45000 | - | 32mA |
| Triode System Class A | 165V | 2200 | 7700 | 17 | 11mA |
| Pentode Push-Pull Class AB1 | 165V | - | - | - | 46mA |
Application Notes
Suitable for audio output, frame output, and sync separator in broadcast receivers and television sets.
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