Wunder Audio CM12 User Manual

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

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. Insertion of a new tube should be done in reverse order
of the description above.

Operation

The CM12 is equipped with an 8-pin Swivel-Mount connector that
plugs into the base of the microphone and screws tight. Always
make sure that the PSU is switched off when plugging the
microphone connector into the microphone and PSU.

How to Change the Polar Pattern

Locate the white pattern switch on the PSU. Use this switch to
change the directional characteristics: omni-, cardioid-, figure-eight,
and eight intermediate positions. The center position with the
Wunder Audio logo is the cardioid setting.

As you turn from position to position it will take a few seconds for the
polarization voltage to settle and achieve the desired polar pattern.

How to Mount the Microphone

A special swivel mount/stand adapter is provided and should always
be used to mount the microphone on floor stands or booms. The
CM12 can now be placed with the microphone on stands or booms