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CM47LE $1,195.00 USD

 The CM47LE features a traditional single stage class "A" transformer coupled U47/U48 tube circuit. 

The military grade 7 pin sub-miniature tube is simple to replace.

  Also, the clever lads at Advanced Audio added a passive cardiod/multi-pattern option.  This allows for 3 patterns between OMNI and Cardiod and 3 patterns between Cardiod and FIG 8.  The traditional passive, cardiod method used in the original U47 is retained in the C position on the CM47LE

Project studios can have a true classic sounding tube microphone for a very affordable price.  Tested replacement tubes will be $21

  The CM47LE is also designed to work seamlessly in any serious commercial recording studio and with a variety of microphone preamps

Circuit:

Like the original circuit designs, we are using a 7-pin military grade pentode tube wired as a triode like the U47 and mounted in a ceramic tube socket.

.  The use of modern, high tolerance components with traditional circuity from the 50's results in a very quiet and very reliable classic performing tube microphone with the extra feature of 9-patterns.

The single class "A" tube circuit stage uses a military grade 5654W sub-miniature 7 pin tube.  Great care was take to closely match the plate current and output impedance parameters to that of the original VF14 tube found in vintage U47 & U48 microphones. 

The custom wound transformer is designed to match the BV08 from a 1959 U47 that was set to s 6.5:1 ratio.

it yields a warm response with a creamy velvet like presence

Capsule:

The CM47LE has a K47 type dual diaphragm/single backplate capsule having a footprint and response similar to one in a 1959 U47.

Advanced Audio Microphones capsules are hand skinned using 6 micron, gold sputtered mylar. Each capsule goes through rigorous testing here in Canada.

     AA AK47 capsule above

    Below original K47 capsule from 1959

Specifications:

• Pattern Selector: 9-pattern from power supply
• Passive Cardiod/Multi-pattern option from body
• Circuit type: Single stage class "A" tube, transformer coupled
• Capsule: centre fed AK47 (true K47 reproduction with brass surround)
• Capsule Polarization: 56V and rear diaphragm 0V in passive-cardioid
• Tube type: 7-pin socketed military grade selected military grade 5654w
• Transformer: Full size BV8 dual bobbin footprint with 6.5:1 ratio.
  
• Transformer Distortion: <.5%@20Hz/+10dBu and <0.05%@50Hz/+10dBu
• Max SPL: 138dB
  
• Frequency response: 25Hz-20kHz + or - 3db
• Equivalent Noise Level: <13dB (A- weighted) selected tube
  
• S/N Ratio: >86dB (Ref. 1Pa A-weighted)
• Sensitivity: -32dBu
• Output impedance <200 ohm (load impedance <1.2K)
• Output connector: Male XLR, 7-pin gold plated
• Switchable 120v-220v power supply
• 25' Gold plated 7 pin cable
• Heavy Duty shock-mount that easily and tightly clips on to the mic
• Sturdy travel case