Wunder Audio CM49 User Manual

1. CM49

The Wunder Audio CM49 Tube Microphone comes with the original
M7 capsule. The M49 was the first condenser microphone capable
of remote pattern control, achieved through electronic means. By
varying the rear-diaphragm voltage against the backplate reference,
a full range of patterns, from omni to cardioid to figure-8, was
accomplished. Because the grille is slanted and presents a
continuously varying profile to the capsule, there are fewer standing
waves generated.

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.

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.

Operation

The CM49 is equipped with a 8-pin Tuchel 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 Yoke mount/stand adapter is provided and should always
be used to mount the microphone on floor stands or booms.

To mount the microphone, fully unscrew the knurled knob on the
side of the metal belt. Place the microphone into the metal belt
making sure that the red jewel on the front of the microphone is
centered into the center hole on the yoke belt. Make sure that the
there is no black rubber grommet in the center hole on the belt, if it
is present, remove it.

Close the metal belt carefully around the microphone making sure
that the leading edge of the metal belt does not scratch the body of
the microphone. Screw the knurled knob clockwise to tighten the
belt around the microphone.

The CM49 can now be placed with the microphone on stands or
booms with standard thread sizes. It may also be swiveled against
the stand axis to suit the recording angle.