B329/12AU7
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BrandMarconi
ClassDouble Triode
BaseB9A
Filament6.3V @ 0.3mA
Construction
Primary TypeDouble Triode
EnvelopeTubular
Sections2
Filament / Heater
Heater Notes12-6V Indirectly Heated
Absolute Maximum Ratings
Plate Voltage300 V
Cathode Current20 mA
H-C Voltage180 V
Audio Performance
Key Features
- Indirectly Heated
- Commercial equivalent of CV491
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics (Per Section) | 250V | 2200 | 7700 | 17 | 10.5mA |
| Typical Operation (Voltage Amp) | 250V | - | 100000 | - | - |
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