12AX7WA - TUBE AMP DOCTOR
VERY LOW NOISE, SOFT HIGH, AND EDGY WITH DOMINANT MIDS
Very low noise but slightly less gain than a regular 12AX7. ...
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Tube Amp Doctor- Ef86/6267 Selected
EF86/6267 SELECTED – TUBE AMP DOCTOR
LOW-NOISE AND LOW MICROPHONICS AND IS USED IN MANY (EUROPEAN) HI-FI PREAMPS
This pentode is selected for low-noise and low microphonics and is used in many hi-fi preamps. It recently gained popularity because it is used in many new guitar amps based on the vintage AC15 circuit.