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CM251

CM251
Brand: Advanced Audio
Product Code: CM251
Price: €995.00
Ex Tax: €808.94
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Summary

The Advanced Audio CM251 is a large-format condenser tube microphone based on the famous Telefunken  ELA M 251. Like the original Telefunken ELA M-251 it is an outstanding choice for vocals. Historically, the original was used on countless hit records and recordings, including Joni Mitchell and Frank Sinatra Advanced Audio’s CM251 emulates the smooth and present character of the original, while staying true to our own circuit designs by not simply designing a clone.

Capsule

The CM251 features Advanced Audio’s own AK12 capsule, an edge-fed, dual diaphragm capsule skinned with 6 micron German mylar that has a frequency response matching within ±2dB the response of the AKG CK12 capsule. The capsules are hand-picked and tested in our shop to insure both sides are within 2pfD.

Circuit

The CM251’s circuit has been designed around a selected 6072a dual triode tube. The unused half of the 6072a is incorporated as a cathode follower, resulting in a much lower output impedance than that of the original circuit. This lower output impedance improves the damping factor and allows the use of a transformer with half the turns-ratio of the original ELA M251. The result is a circuit with more headroom than the original plate fed circuit with a better low frequency and high frequency response. The open top end sound of the mic is smoothed out with the use of a capacitor rolling off some of the high end. The result is a 3dB drop at 10k.

Output

The CM251 utilizes a BV18 dual-bobbin output transformer. Wound to the original specs, it is easily driven by the optimized low-impedance 6027a circuit, yielding 6db more output level than the original transformers used in the AKG C12 and ELAM 251.  This allows the head amp gain to be further reduced, increasing the total headroom (output level before distortion) by 6dbB.

The BV18 transformer is driven through a 2.2-ufd mylar capacitor to take advantage of the ability of both capsule and transformer to respond to frequencies reaching down to 10Hz.  The transformer can deliver +18dBm with less than 1% distortion across the audio spectrum.

Who is using AA microphones? Read more>>

Specifications:

  •  Dual diaphragm, dual back-plate, 35mm edge fed AKG type capsule with 6-micron mylar.
  •  Class A 6072a tube circuit
  •  BV18 output transformer
  •  Frequency response: 15Hz to 20kHz
  •  Noise: -17dB (A-weighted)
  •  Impedance: <200 ohms
  •  Distortion: 0.5% @ 125dB
  •  Output: +18dBm @<1% distortion into 1.2K ohms.
  •  Robust shock mount
  •  Aluminum road case
  •  25’ 7 pin cable
  •  9 selectable pick-up patterns switch from the included power supply.

 

CM251, ELAM251, ELA M251, Telefunken ELA M-251,  vintage mic modern technology

 

CM251 inspired by  Telefunken ELA M 251

Vintage inspired microphones with modern technology!

ELAM 251 clone, ELA M251 clone, new ELAM 251,

inspired by Telefunken ELA M-251.

 

 

 

Write a review

Your Name:


Your Review: Note: HTML is not translated!

Rating: Bad           Good

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Description

Summary

The Advanced Audio CM251 is a large-format condenser tube microphone based on the famous Telefunken  ELA M 251. Like the original Telefunken ELA M-251 it is an outstanding choice for vocals. Historically, the original was used on countless hit records and recordings, including Joni Mitchell and Frank Sinatra Advanced Audio’s CM251 emulates the smooth and present character of the original, while staying true to our own circuit designs by not simply designing a clone.

Capsule

The CM251 features Advanced Audio’s own AK12 capsule, an edge-fed, dual diaphragm capsule skinned with 6 micron German mylar that has a frequency response matching within ±2dB the response of the AKG CK12 capsule. The capsules are hand-picked and tested in our shop to insure both sides are within 2pfD.

Circuit

The CM251’s circuit has been designed around a selected 6072a dual triode tube. The unused half of the 6072a is incorporated as a cathode follower, resulting in a much lower output impedance than that of the original circuit. This lower output impedance improves the damping factor and allows the use of a transformer with half the turns-ratio of the original ELA M251. The result is a circuit with more headroom than the original plate fed circuit with a better low frequency and high frequency response. The open top end sound of the mic is smoothed out with the use of a capacitor rolling off some of the high end. The result is a 3dB drop at 10k.

Output

The CM251 utilizes a BV18 dual-bobbin output transformer. Wound to the original specs, it is easily driven by the optimized low-impedance 6027a circuit, yielding 6db more output level than the original transformers used in the AKG C12 and ELAM 251.  This allows the head amp gain to be further reduced, increasing the total headroom (output level before distortion) by 6dbB.

The BV18 transformer is driven through a 2.2-ufd mylar capacitor to take advantage of the ability of both capsule and transformer to respond to frequencies reaching down to 10Hz.  The transformer can deliver +18dBm with less than 1% distortion across the audio spectrum.

Who is using AA microphones? Read more>>

Specifications:

  •  Dual diaphragm, dual back-plate, 35mm edge fed AKG type capsule with 6-micron mylar.
  •  Class A 6072a tube circuit
  •  BV18 output transformer
  •  Frequency response: 15Hz to 20kHz
  •  Noise: -17dB (A-weighted)
  •  Impedance: <200 ohms
  •  Distortion: 0.5% @ 125dB
  •  Output: +18dBm @<1% distortion into 1.2K ohms.
  •  Robust shock mount
  •  Aluminum road case
  •  25’ 7 pin cable
  •  9 selectable pick-up patterns switch from the included power supply.

 

CM251, ELAM251, ELA M251, Telefunken ELA M-251,  vintage mic modern technology

 

CM251 inspired by  Telefunken ELA M 251

Vintage inspired microphones with modern technology!

ELAM 251 clone, ELA M251 clone, new ELAM 251,

inspired by Telefunken ELA M-251.

 

 

 

Write a review

Your Name:


Your Review: Note: HTML is not translated!

Rating: Bad           Good

Enter the code in the box below:



Tags: CM251
Advanced Audio Microphones Europe