The CAD M9 is a cardioid single tube externally biased condenser microphone that features servo-valve technology. It's a natural bridge between the valve technology developed for CAD's VX2 microphone and the servo op-amp technology developed for their M-Series mics. The M9's head amp is a 12AX7 tube in a circuit optimized for super wide dynamic range and low noise. The output stage (balanced high speed dual op-amp) allows for long cables without affecting microphone performance.
CAD M9 Specifications