Manual

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1. CM12

The Wunder Audio CM12 Tube Microphone is targeted to the

professional with the most demanding criteria. The CM12 uses the

larger Hiller T14/1 output transformer that was standard in the early

C12. The beautiful hand made capsule is a CK12 style. These

boutique microphones are hand assembled in Texas per customer’s

order. Tubes are hand tested NOS GE 5-star 6072.

It should be stressed that vacuum tubes, with their heater ﬁlaments,

are much more delicate than solid-state components. Consequently,

the user should take great care in handling the microphone. A drop

from even a moderate height may cause the ﬁlament to break and

may result in immediate failure of the microphone. It would be

advisable for the user to keep a spare tube – specially selected by

the Wunder Audio Service Department – always ready for

replacement.

It is important to note that the tube may have become slightly

unplugged from the tube socket during shipping. If the microphone

has no audio output, 99% of the time it is a result of a slightly

unplugged tube.

How to Replace the Vacuum Tube

Repairs are to be carried out only by experienced, authorized

service personnel. Unauthorized opening of, or modiﬁcation to

the equipment shall void the warranty.

The microphone tube requires a high operational voltage.

Contact with the voltages present in the interior of the

microphone and PSU may result in injury or death; therefore,

the microphone and PSU must be opened only by an

authorized, qualiﬁed technician.

The microphone must be operated only with the supplied

cable. Because hazardous voltages are generated by the PSU

that may result in injury or death, always ensure that the

microphone cable is undamaged. Damaged cables must no

Summary of content (6 pages)

PAGE 1
. CM12 The Wunder Audio CM12 Tube Microphone is targeted to the professional with the most demanding criteria. The CM12 uses the larger Hiller T14/1 output transformer that was standard in the early C12. The beautiful hand made capsule is a CK12 style. These boutique microphones are hand assembled in Texas per customer’s order. Tubes are hand tested NOS GE 5-star 6072. It should be stressed that vacuum tubes, with their heater filaments, are much more delicate than solid-state components.
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longer be used. 1. Disconnect microphone from PSU. 2. Turn the three grub screws at the lower end of the microphone into the body in a clockwise direction until the outer housing can be pulled off in a downwards direction. 3. The vacuum tube may now be removed by depressing the lower (rubber) shockmount to free the tube with a forward motion. Taking the tube socket in one hand and the tube itself in the other hand will enable you to separate the vacuum tube from the socket. 4.
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with standard thread sizes. It may also be swiveled against the stand axis to suit the recording angle. Powering of the Microphone The required PSU is included with the microphone. It is clearly marked and should be quite obvious by connector type and size how to connect the microphone to the power unit with the supplied CM12 microphone cable. The audio signal may be taken from the transformer-balanced power unit by a conventional audio cable with standard XLR-type connector.
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directly next to the large AC transformer. To set the switch to 115V, toggle the switch towards the transformer. To set the switch to 230V, toggle the switch away from the transformer. Warning: Connecting the CM12 to the wrong AC voltage may destroy the unit and cause fire and/or electric shock. Replacing Fuses The fuse protecting the primary circuit is located outside the PSU. Unscrew the black fuse cover to open the fuse compartment.
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stored in a cool, dry place and protected from dust. Cleaning Under normal conditions the microphone body may become dirty and covered with fingerprints. One or two drops of Lubriderm unscented hand lotion may be gently rubbed into the nickel finish with a terry cloth and then wiped clean. Troubleshooting 1. Microphone not operating Possible causes: a. PSU not switched on b. Microphone is not connected to PSU c. Tube has become unplugged 2. Signal is noisy Possible causes: a.
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Powering: Via the included powering unit with 115/230 VAC Maximum Sound Pressure Level: 138 dB Sensitivity: approx 1 mvolts per dyne / cm sq Non Linear Distortion: less than or equal to 0.5% at 100 dyne / cm sq Equivalent Noise: 16 dB (a-weighted) Connector: Large-sized swivel, 8 pin Dimensions: 254 mm (10'') x 41.3 mm (1.625'') Shipping Weight: Approx. (~12 Ibs.