12AX7EH
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BrandElectro-Harmonix
ClassPreamp Dual Triode
BaseNoval
Filament6.3V @ 300mA
Construction
Primary TypeHigh-Mu Twin Triode
EnvelopeGlass
Sections2
Filament / Heater
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation1.2 W
Grid 1 Voltage-50 V
H-C Voltage180 V
Audio Performance
Key Features
- High-mu
- Low microphonics
- Commonly used in guitar amplifiers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 250V | 1600 | 62500 | 100 | 1.2mA |
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