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TNC Audio ACM-900

Pricing & Availability

  • MSRP: n/a
  • Discontinued


BidirectionalTNC Audio ACM-900

Bidirectional Ribbon Microphone

The ACM-900 is an active ribbon microphone with a tube amplifier/impedance conversion circuit. It was sold only as part of a “group buy” of low-cost microphones in 2007.

ACM-900 PCBThe circuit incorporates two transformers, the first of which presumably provides significant step-up gain. Both transformers are mounted in metal cans on the PCB.

The tube is a 6J1 subminiature pentode.

ACM-900 Side ViewThe mic included an elastic shockmount, power supply, cables, and a padded aluminum flightcase.

[ACM900 photos: DJS~NJ]

Permalink: TNC Audio ACM-900

The mic was released in 2007.


Pickup Patterns Pads & Filters
Bidirectional (14.1 mV/Pa; 30 - 15,000 Hz)
Ribbon Construction Impedance SPL/Noise
200 Ohms (Low) Max SPL: 138 dB
Weight Length Max Diameter Interface(s)
n/a n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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