12AU7A
32 Tubes in archive
BrandMAZDA BELVU
ClassDouble Triode
Base9c 12 (noval)
Filament6.3V @ 300mA
Construction
Primary TypeTriode
EnvelopeA 22-2
SectionsDouble
Filament / Heater
Heater NotesAlimentation en série ou en parallèle
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.75 W
Grid 1 Voltage-100 V
Cathode Current20 mA
H-C Voltage180 V
Audio Performance
Key Features
- Cathodes séparées
- Chauffage indirect
- Préamplificateur A.F.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 100V | 3100 | 6500 | 20 | 11.8mA |
| Class A1 | 250V | 2200 | 7700 | 17 | 10.5mA |
Application Notes
En montage déphaseur, la limite de résistance entre filament et cathode est de 150 kOhms.
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