Wunder Audio CM67 User Manual

1. CM67

The Wunder Audio CM67 Tube Microphone is targeted to the
professional with the most demanding criteria. These boutique
microphones are hand assembled in Texas per customers order.
Tubes are hand tested NOS EF86.

How to replace the vacuum tube

Disconnect microphone from PSU.

Remove the three nickel screws at the lower end of the microphone
grille housing.

The Grille can be pulled off in upwards direction.

Next remove the small screw that is located several inches below
the Wunder Audio diamond badge.

The Complete body shell can now be pulled off in an upwards
direction.

The vacuum tube can now be removed by wiggling the tube with a
downward motion taking care to clear the large black transformer
below it.

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

How to change the polar pattern.

Locate the pattern switch on the PSU. Use this switch to operate the
Directional Characteristics: Omni-, cardioid-, figure-eight, and eight
intermediate positions. The center position 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 shock mount/stand adapter is provided and should always
be used to mount the microphone on floor stands or booms. The
clamp of the shock-mount should be guided from the lower end of
the microphone upwards until it is placed near the gravitational
centre (slightly below the badge or centered over the badge). The
shock-mount 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.

Powering of the microphone:

The required PSU is included in the delivery. It is clearly marked and
quite obvious by connector type and size, how to connect the
microphone to the power unit with the supplied CM67 microphone
cable. The audio frequency may be taken from the power unit
transformer balanced by a conventional audio cable with standard
XLR-type connector.

2. The CM67 Power Supply

This PSU supplies the microphone with the –6.3 volt filament and
210V plate voltage for the vacuum tube.

The CM67 PSU has internal AC voltage sensing and the user
does not need to change any internal settings on the PSU to
use with different AC voltages worldwide

Power Connector

Especially on tour, you may need to connect the unit to a power
outlet that does not match the power connector on the supplied
power cable. Purchase a matching power cable locally that complies
with IEC and local safety standards and has a power connector with
a chassis ground pin. While in the same area, use this “local“ power
cable only.