Wunder Audio CM67
Multi-Pattern Tube Condenser Microphone
The CM67 is a modern recreation of the Neumann U67. Both are multipattern tube condensers based on the K67 capsule, EF86 tube, and Neumann’s unique negative-feedback circuitry.
The CM67, like the U67, uses a vintage Telefunken EF86 pentode (wired as a triode), installed within a Teflon socket. It runs at 6.3V.
Wunder Audio has reproduced the unusual transformer in the U67. It was designed to attenuate the K67 capsule’s native high-frequency boost, via negative feedback created by a tertiary winding on the transformer. The CM67 transformer is produced in the US by AMI.
Whereas the U67 was a 3-pattern mic, switchable via a rotary mechanical switch located beneath the capsule, the CM67 provides 9 polar patterns: Omni, Wide Cardioid, Cardioid, Hypercardioid, Figure-8, plus intermediate steps. Patterns are selected via a 9-way control on the power supply; a solid-state relay within the grille housing effects the necessary electrical switching.
Another change from the U67 is the use of point-to-point wiring for the high-impedance portions of the circuit near the capsule.
The K67 capsule is a 34mm design, like Neumann’s original, with diaphragms made of 6-micron Mylar. The mounting bezel is made of white porcelain, which according to Mike Castoro of Wunder Audio is more resistant to contamination than a plastic mount would be.
[The power supply] is the result of complete creative and engineering freedom. Its proprietary design features a high-voltage path that runs constant current and balances constant current against a shunt regulator. The result is a completely clean voltage to the microphone free of any RF interference.
The CM67 includes a wooden storage box for the mic, power supply, elastic shockmount, and vintage tweed carrying case.
Permalink: Wunder Audio CM67
The mic was released in 2012.
|Pickup Patterns||Pads & Filters|
| Capsule diameter: 34mm
Diaphragm gauge: 6 microns
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