The Electronaut M97 is a single stage vari-mu compressor with a powerful and fast controller amplifier akin to the legendary Fairchild 670 but with none of the limitations of vintage designs.

The M97 uses a four quadrant arrangement with three valve sockets in each, a 9-pin to accommodate the ultra-rare 6386 tube and two 7-pin sockets to accommodate 6BA6 wired in triode-mode valves or equivalent. Each of the quadrants include a switch to configure the 7-pin sockets in 6V or 12V filaments. This configuration provides maximum flexibility and allows for a wide choice of valves, offering a huge range of possible combinations. In total, the M97 uses 14 tubes and 7 transformers in the audio path.

Unlike any other compressor, the M97 also uses a Dorrough-inspired meter which provides immediate display of average and peak levels making it instantly compatible with digital 0dBFS. The meter can be used to display input and output levels, post compression level, gain reduction and even a 2nd harmonic measurement in the compressor itself.

Controls include a 1dB step input attenuator, continuously variable attack and release controls and two big Threshold and Slope controls which affect the threshold and amount of compression applied to the signal. The Attack can be set to ultra-fast setting 50 uS.

Maximum Gain: Approximately 17 dB
Frequency Response
(with Input Attenuator set to -6 dB): 20 Hz to 20 kHz +/– 1.3 dB
Frequency Response
(with Input Attenuator set to 0 dB, Zsource = 100 1): 15 Hz to 53 kHz +/– 1.3 dB
Line Input: 600 1 floating transformer balanced
Sidechain Input Impedance: 1200 1 floating transformer balanced
Line Output Impedance: 120 1 floating transformer balanced, internally terminated by 1800 1
Recommended Load Impedance: 10 k1 or higher
Minimum Recommended Load Impedance: 600 1
Signal to Noise Ratio: > 85 dB
Max. Output Level for 1% THD
(no limiting): +28 dBu
THD + Noise at +4 dBu
(no limiting): 0.02%
THD + Noise at +4 dBu
(10 dB limiting): 0.7%
Recommended Upper Limit of Compression for High Fidelity: 12 dB
Power Requirements: 120V 60 Hz or 240V 50 Hz, 240 Watts MAX
Dimensions: 19” (483 mm) width
14” (356 mm) depth
7” (178 mm) height
Unit Weight: 34 lbs (15.5 kg)

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