This microphone has been meticulously created to meet the demand for
the U47 sound using historically correct components around the “heart“
of the microphone – the original, specially selected EF14 tube.
It should be stressed at this point, that vacuum tubes with their heater
filaments are much more delicate than solid-state components.
Consequently, the user has to take great care in handling the microphone.
Drops from even moderate heights may cause the filament to break and
would result in immediate failure of the microphone. It would be advisable
for the users to keep a spare tube – specially selected by an Wunder
Audio Service Department – always ready or replacement.
Please note: tube may have become slightly unplugged in shipping.
If
after shipping the microphone has no audio output, 99% of the time it is a
result of a slightly unplugged tube.
Replacing the vacuum tube
1. Disconnect microphone from PSU.
2. Remove the three bright nickel screws at the lower end of the
microphone grille housing.
wunder cm7
Repairs are to be carried out only by experienced, authorized service personal. Unauthorized
opening or modification to the equipment shall void the warranty. High Operation voltages are
required for the tube in the microphone. Contact with the voltages present in the interior of the
device can result in injury of death; therefore, the microphone and PSU must be opened only
by authorized, qualified personnel. The microphone must be operated only with the supplied
cable. Since hazardous voltages are generated by the PSU that can result in injury or death,
always ensure that the microphone cable used is undamaged, Damaged cables must no
longer be used.
