Simplicity is the hardest design principle to follow. It’s at the heart of Wunder's approach to the CM67.
Seductively simple, the Wunder CM67 offers the presence you’d expect from Wunder Audio underpinned by the latest technology and ideas in PSU design.
The K67 capsule, which since 1960 has become the most common and most
copied condenser capsule in the world, utilizes a two-piece backplate,
allowing the diaphragms to be tuned individually and then matched for
equivalent response.
The tube is a vintage Telefunken EF86, a pentode wired into this circuit
as a triode. It uses a 6.3V filament voltage, and is wired to the PCB
via a Teflon socket.
The transformer in the CM67 is somewhat unique. It makes use of an
elaborate feedback network known as a tertiary winding, which creates
negative feedback through the capsule to the tube for its HF
de-emphasis. It creates a roll-off in the HF response in order to
compensate for the natural HF peak due to the original design of the K67
capsule.
It takes a very special transformer to accomplish this task while
simultaneously achieving such an impressive sound. Some U67 recreations
offer a quick fix to simulate the sound of the original, but most of the
modifications that attenuate the top end achieve a less than desirable
result. This is not exactly a good trade-off.
The CM67 is perfect for vocals where a smoother sound is desired as the
67s are prized for their “warmth.” The CM67 is also a terrific
all-purpose microphone, as it works exceedingly well in a close-mic
situation. The CM67 is excellent for drums (kick, snare, overheads,
room) and guitar amp mics. Because it has a very nice top and bottom,
and being very natural in the way it brings out the best from any
source, the CM67 is a serious pro studio workhorse.
Designed without compromise, Wunder Audio’s new tube microphone Power
Supply Unit 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 is supplied with its dedicated Power Supply Unit, shock mount, Tuchel microphone cable and quarter sawn oak case.
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