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The U-47’s output was 5dB hotter in Cardioid mode than in Omni, 
because the capsule’s rear diaphragm was bypassed in Cardioid mode, 
avoiding the capacitance loss of having it in the circuit

Also, the Proximity effect of the Grille (the cardioid pattern will sound 
fuller and than the omni pattern) is normal for this type of microphone. In 
fact, the Proximity effect works very well and is a much desired effect.

Mounting

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 is designed for use 
with stands or booms using standard thread sizes. It may also be 
swiveled against the stand axis to suit the recording angle.

Powering up

The required PSU is included with the microphone.   The connector type 
and size are clearly marked. using the supplied CM7 microphone cable. 
The audio signal is taken from the power supply via a standard XLR-type 
mic cable.

After interconnection of the microphone and AC line, the main switch may 
be turned on. Operating condition is indicated by the power lamp.

The warm-up time of the CM7 is approximately one minute. When your 

CM7 is new, a 24 hour burn-in period is recommended.

The CM7’s tube will “break in” over a period of time enabling the CM7 to 

sound subtly better over a period of time.

The CM7 Power Supply

This PSU supplies the microphone with the 5-volt filament and 105V plate 
voltage for the vacuum tube,

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Summary of Contents for cm7

Page 1: ...ipping 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...

Page 2: ... the vacuum tube from the socket 8 Installing a new tube is simply the reverse order of these steps Operation The CM7 is equipped with a 6 pin Tuchel connector that plugs into the base of the microphone and screwed finger tight Always make sure that the PSU is switched off when plugging the mic connector into the mic and PSU Changing the Pattern Locate the white pattern switch window at the bottom...

Page 3: ...r centered over the badge The shock mount is designed for use with stands or booms using standard thread sizes It may also be swiveled against the stand axis to suit the recording angle Powering up The required PSU is included with the microphone The connector type and size are clearly marked using the supplied CM7 microphone cable The audio signal is taken from the power supply via a standard XLR...

Page 4: ...ng AC voltage may destroy the unit and cause fire and or electric shock Replacing the Fuse The fuse protecting the primary circuit is located outside the PSU Unscrew the black fuse cover to open the fuse compartment Replace the fuse with a new fuse of the same type T 500 mA for 115V 250 mA for 230V and close the fuse compartment lid AC Power Connector Especially on tour you may need to connect the...

Page 5: ...away so that dust does not accumulate A microphone which is unused for a prolonged period should be stored in a cool dry place Cleaning Under normal conditions the microphone body may become dirty and covered with fingerprints One or two drops of Lubriderm unscented hand lotion can be gently rubbed into the nickel finish with a terry cloth and then wiped clean Troubleshooting Microphone not operat...

Page 6: ... mV Pa 20 18 000 Hz Electrical Impedance 200 ohms Powering Via the included powering unit with 115 230 VAC Maximum Sound Pressure Level 128 dB Connector Large sized Tuchel 6 pin Dimensions 240 mm 9 45 63 mm 2 48 Shipping Weight Approx 12 Ibs Included Accessories CM7 Power Supply EF14 tube connection cable Shock mount Quarter sawn oak case 6 ...

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