Neumann M147 Tube large-diaphragm condenser microphone - early production, serial # 1284 - in EXCELLENT condition, and perfect working order. This microphone has been used in a private, smokeless studio, and has always been stored in its original case.

The Neumann M147 microphone is highly regarded for its

• Highly sensitive mic, amazing at capturing the sound around instruments or vocals
• Legendary K 47 capsule which offers full frequency response. Components like Neumann’s famous capsules are assembled by hand in state-of-the-art clean rooms and individually tested for extreme consistency
• Tube-based impedance converter and transformer-less output for low self noise

• German Manufacturing: Unlike mass-market brands that outsource to low-wage countries, Neumann manufactures in Germany, maintaining high labor standards and precise build tolerances. 
• Longevity & Serviceability: Neumann gear is built to last a lifetime. Unlike cheaper alternatives, these pieces are highly serviceable, holding immense resale value and remaining repairable even decades later. 

Neumann M 147 Tube Condenser Microphone Features:

• No-compromise large-diaphragm condenser mic
• Famous Neumann K 47 capsule with single polar pattern (cardioid)
• Ideal for vocals and acoustic instruments
• Signal/Noise ratio 82 dB (DIN/IEC 651)
• Frequency response 20Hz - 20kHz
• M 149 tube impedance converter
• Transformerless output for low self noise and high dynamic range
• High quality aluminum case, mic cable and compact universal power supply included

Like the majority of valve microphones, the M147 is accompanied by a separate power‑supply unit, the N149A. This is a switched‑mode device capable of accepting mains supply voltages between 90 and 250V at either 50 or 60Hz, and generates ±70V for the valve and capsule biasing as well as +32V and +5V supplies. These are all filtered to prevent supply‑rail interference reaching the mic, and are conveyed over a supplied 30'cable with screw‑locking eight‑pin DIN connectors.

A sensor line is incorporated, which prevents the power supply from energizing when the microphone is disconnected. This sensor loop also ensures that correct operating voltages are maintained even over long cable runs — the manual suggests that up to 100m of cable can separate the PSU and the mic.

The balanced microphone output is on a conventional three‑pin male XLR at the front of the PSU, and incoming phantom power is tolerated without problems. An illuminated rocker switch enables the power unit output, the internal green LED remaining only dimly lit until the system detects a connected microphone.