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9 polar patternsSM Pro Audio MC03 Mk 2

Multi-Pattern Tube Condenser Microphone

The MC03 is a multipattern tube microphone with an innovative two-way amplifier circuit. The mic is powered by an included power supply, but when phantom power is enabled, a relay on the mic’s PCB switches to an alternate circuit, providing a second sound color.

According to the manufacturer, the non-phantom-power circuit is a neutral tone, whereas the alternative circuit provides a colored tone, in which the mids and highs are enhanced.

The tube is a 12AX7B, a high-gain dual-triode, sourced from a Chinese manufacturer. It is soldered, not socketed, into the amplifier circuit.

SM Pro Audio MC03 Mk II Circuit and TubeCuriously, the mic’s circuit board is stamped with an Alctron part number, HSGT-2B. But the switching amp circuit was designed by Australia’s JLM Audio, and apparently retrofitted onto the GT2B board.

The capsule is a K67 derivative, with a 32mm outside diameter and presumably a 25mm diaphragm. The backplate shows the distinctive K67 drilling pattern. The dual diaphragms are made of 6-micron gold-sputtered Mylar, and are center-terminated.

SM Pro Audio MC03 kitThe mic ships in an aluminum flight case with an elastic shockmount, power supply, and cable.

The SM Pro Audio MC03 Mk 2 is also known as: MC03.

The mic was released in 2009.


Pickup Patterns Pads & Filters
Omnidirectional (12 mV/Pa; 20 - 20,000 Hz)
Cardioid (12 mV/Pa; 20 - 20,000 Hz)
Bidirectional (12 mV/Pa; 20 - 20,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 25mm
Capsule diameter: 32mm
Diaphragm gauge: 6 microns
200 Ohms (Low) Max SPL: 130 dB
Self-noise: 18.0 dB(A)
Weight Length Max Diameter Interface(s)
n/a 183mm (7.20'') 71mm (2.80'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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