Advanced Audio Microphones CM47VE

Advanced Audio CM47ve

The Advanced Audio CM47ve is a large dual-diaphragm, multi-pattern, tube condenser microphone inspired by the famous Neumann U-47. The CM47ve is a great choice for vocals, saxophones, acoustic instruments, and excels in front of bass and guitar amps. The CM47ve provides response within +or - 1.5dB of a U47 microphone made after 1958.

Capsule

Our Advanced Audio CM47ve features our AK47 capsule. The AK47 is an exact reproduction of the Neumann K47. The AK47 is a 32mm capsule with single back-plate, random drill pattern and is skinned with 6 micron mylar. The CM47ve yields a more vintage, 'darker' response curve than our CM47 above 10kHz but has a very present sound with a slightly wider proximity effect than the CM47.

Circuit

The circuit is based on the very hifi 6072 tube optimized with a two-stage Class A design. 

This circuit provides a much lower output impedance with more headroom than the circuit used in the original U47. The lower output impedance provides a faster damping factor when driving the BV8 type transformer, delivering a better transient response than the original design.

Selected 6072a tubes are some of the quietest tubes made, and are much less susceptible to microphonics than the metal-clad vf14 tubes used in the original U47 tube microphone.

The dual-bobbin output transformer with its hum bucking configuration and our optimized circuit will deliver +20dBu with less than 1% distortion.

The output transformer is driven with a 2.2 ufd metal-film capacitor to take advantage of the transformer’s response down to 10Hz.

Specifications:

• 1.07” (35mm) single back plate 6-micron German mylar diaphragm AK47 capsule
• 9 selectable pickup patterns remotely switched from the power supply
• Dual bobbin BV8 (6.5:1 ratio) output transformer
• 6072a tube Class A dual stage (CCDA)
• Frequency response: 25Hz to 20kHz +/–3dB
• Noise: -17dB (A-weighted)
• Impedance: < 200 ohm
• Distortion: < 0.5% @128dB
• Output: +20dBu with less than 1% distortion into 1.2K load
• Robust shock mount that threads onto microphone body
• Flight case.