Pattern Control Unit


Pattern Control Unit for operating The M 49 V and all vintage Neumann microphones utilizing the AC 701 tube.


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This classical pattern control unit contains a mains transformer. It automatically switches between the 100-120 V and 220-240 V ac mains voltage ranges.

In the OFF position the NM V draws no current.

To ensure a long life, the tube is heated up gently, with current limiting. A very effective filtering inside the NM V ensures very high-quality operating voltages, with a minimum of residual noise voltages.

Note: The new NM V is suitable in principle for operating all vintage Neumann microphones utilizing the AC 701 tube, such as the older M 49 and M 249.

Older devices as N 52 (a, h) and NN 48 (a, b, h) are not suitable for operating the M 49 V, due to their current and voltage limitations.

Operation with Unbalanced Inputs

At the pattern control unit, the audio signal isavailable at a balanced, floating XLR 3 output. The output is wired as per IEC 60268-12 and IEC 61938:

Pin 1: 0 V/ground
Pin 2: audio signal (+phase)
Pin 3: audio signal (–phase)

So pin 2 is the “hot phase”, pin 3 must be connected to ground when used with unbalanced inputs


Color black

CAT. NO. 008687

  • NM V Pattern Control Unit

WARNING (for California residents only): This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects and other reproductive harm. For more information go to:

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