Configuration Of The Output; Additional Information On The Circuit Design; Getting Started - Marek Design RS1 Owner's Manual

3. Configuration of the output

The RS1 control unit has a balanced 3 pin XLR output. The pin assignment corresponds to DIN
45 599, part "I" and IEC 268-12 (pin.conn. 130-x-IEC 02). Audio is connected to pins 2 and 3;
the ground to pin 1. A sound pressure rise at the membrane causes a positive voltage to appear at
pin 2.
The RS1 is made for the balanced, floating amplifier and mixing console inputs generally in
studio use. Pin 2 is "hot," pin 3 must be connected to ground when used with unbalanced inputs.
The RS1 has an electrical output impedance of about 200 ohms. The input impedance of the
following amplifier should be at least five times as great, therefore 1000 ohms or greater.
The RS1 does not use phantom power. All operating voltages come from its control unit.

4. Additional information on the circuit design

In contrast to other tube microphones, the RS1 uses a very special circuit design. The
transformerless, tube balanced output is 200 Ohm's impedance. In order to obtain this, the circuit
uses a special "M" tube with very high current capacity, low microphonics and low self noise.
During its entire life, the operating level of the tube is kept stable.
There is a special six conductor cable. It optimizes the different currents used between the
microphone and the control unit which ensures a most accurate amplifier and highest
transmission quality of audio. It must not be replaced by cables which are not appropriate for this
system!
The operating voltages for the microphone are delivered by the control unit using a switching
type regulated output ensuring precise operating voltages.

5. Getting started

The RS1 tube microphone system comes in a case including the microphone with integrated
elastic shock mount with 3/8" thread, the control unit, 10 meters of six conductor microphone
cable and a power cable. A cloth dustover should be used when the microphone is not in use.
Only use control unit with the correct mains voltage!
Do not connect and switch on the mains supply until all other connections have been made!
Within a few minutes after the system is hooked up and turned on, the microphone is warmed up
and ready for use.
When switching the control ring of capsule characters, hand-noise is adapted.
The on/off switch on front of the control unit functions as a primary voltage interrupt for the
feeds from the built-in mains unit.
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