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Wunder Audio CM67

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  • MSRP: $4,295


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CM67 Documentation

9 polar patternsWunder 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.

Wunder CM67

Wunder Audio

[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 Dimensions Impedance SPL/Noise
Capsule diameter: 34mm
Diaphragm gauge: 6 microns
Weight Length Max Diameter Interface(s)
n/a n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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