1965 - The CMT 3- / 4- / 5- Series
Transition from Nickel Diaphragms to Mylar Diaphragms

Only one year later transistorized condenser microphones of the series CMT 3-/4-/5- were developed. Now that field-effect transistors of the necessary quality were available for use in microphones at the highest quality level, this series represented a transition in solid-state microphones from RF circuit technology to the superior linearity of audio frequency technology. At the same time, the previous metal membrane material was replaced by specially manufactured Mylar with improved reliability.

The available capsules remained the same types: The CMT was delivered as omni (for example CMT 52), universal cardioid (CMT 54), close speech cardioid (CMT 540), supercardioid (CMT 541), switchable omni/cardioid (CMT 55) and switchable omni/cardioid/figure-eight (CMT 56) with single diaphragm design. The capsules specifications were close to the data of the current capsules MK 2S, MK 4, MK 40, MK 41, MK 5, MK 6 (see www.schoeps.de)

Microphones of the CMT series were manufactured until the Eighties. They are still serviced by SCHOEPS and may reach today's Colette quality without problems.

Power Supply Overview:

CMT 3- 12V phantom power
CMT 3p 12V phantom power with reverse polarity (i.e. with the plus pole grounded)
CMT 4- 12V parallel feed (T-power)
CMT 5- 48V phantom power

Connector Overview:

CMT-D 3 pin Tuchel connector (pin1 = + signal, pin2 = GND, pin3 = - signal)
CMT-U 3 pin XLR connector (pin1 = GND, pin2 = + signal, pin 3 = - signal)

Accessories:

DZT 1 -10dB attenuator
DZT 5 -10dB attenuator with high frequency emphasis
Both could be inserted between capsule and amplifier.

LS 5 signal light unit (picture below), a red plus a green lamp shows the speaker when he is on air. An aditional pushbotton allowed the speaker a feedback to the control room.


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