Wunder Audio CM12 - Manual (Page 5)

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. Tube filament has become damaged.
3. Specifications of the Microphone
Directional Characteristics: omni-, cardioid-, figure-eight, and eight
intermediate positions remotely controlled from the
microphone on the powering unit
Frequency Range: (20 - 20,000 Hz)
Electrical Impedance: 200 ohms