12AX7A
56 Tubes in archive
BrandMazda Belvu
ClassDouble Triode
BaseNoval
Filament12.6V @ 150mA
Construction
Primary TypeTriode
EnvelopeA22-2
Base MaterialGlass
SectionsDouble
Filament / Heater
Heater NotesAlimentation du filament en série (12,6V) ou en parallèle (6,3V)
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 1 Voltage-50 V
Cathode Current8 mA
H-C Voltage180 V
Audio Performance
Typical THD5%
Key Features
- Cathodes séparées
- Préamplificateur A.F.
- Montage quelconque
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation 1 | 100V | - | 80000 | 100 | 0.5mA |
| Typical Operation 2 | 250V | 1600 | 62500 | 100 | 1.2mA |
Application Notes
Commonly used in AF preamplifiers and phase inverters. Class A amplifier conditions provided for anode voltages between 90V and 300V.
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