Tube-number record
LN309
0 archive entries
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
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 | 165 V | 4700 | 45000 | — | 32 mA |
| Triode System Class A | 165 V | 2200 | 7700 | 17 | 11 mA |
| Pentode Push-Pull Class AB1 | 165 V | — | — | — | 46 mA |
Application Notes
Suitable for audio output, frame output, and sync separator in broadcast receivers and television sets.
0 results