Advanced Audio Microphones CM-67
Multi-Pattern Tube Condenser Microphone
The CM-67 is a large-diaphragm, multipattern tube microphone intended to recreate the sonics of the Neumann U67.
The large-diaphragm capsule is called the “AK-67;” it is a 35mm OD design, with ~29mm diaphragms made of 6-micron Mylar. Like its namesake, the Neumann K67, it is a center-terminated, dual-backplate capsule. According to Dave Thomas, it incorporates design changes engineered by John Peluso and Werner Ruvalds to give the capsule a less-boosted high-frequency response.
The tube is a 6072a dual triode. This differs from the EF86 pentode used in the U67.
The transformer is described by Dave Thomas as a 6.5:1 BV8 (not a BV11, as is reported elsewhere). This BV8 is a Chinese-made copy of the transformer used in the Neumann U47.
The amplifier design is a CCDA, or “constant current draw amplifier.” This circuit is used in the company’s CM47 and CM12; the primary differences between these three microphones are the capsules, output transformers, and headbasket designs.
The CM-67 includes an elastic shockmount and a flight case. Advanced Audio also sells the “CM-67SE,” which includes a pad and filter, and a tapered body with sloped grille as used in the original U67.
Permalink: Advanced Audio Microphones CM-67
|Pickup Patterns||Pads & Filters|
(n/a mV/Pa; 25 - 20,000 Hz)
Cardioid (n/a mV/Pa; 25 - 20,000 Hz)
Bidirectional (n/a mV/Pa; 25 - 20,000 Hz)
| Diaphragm diameter: 28.7mm
Capsule diameter: 35.1mm
Diaphragm gauge: 6 microns
|n/a||Max SPL: 125 dB
Self-noise: 17.0 dB(A)
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