Gefell MT 71 S Cardioid Microphone  From Gefell

Solid State (FET) Cardioid Condenser

Microtech Gefell

$1,228.38

Retail:  $1,300.00

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Manufacturer's Description from Gefell

The MT 71 S condenser microphone equipped with our proven large diameter membrane capsule features outstanding performance, a high sensitivity and a improved signal-to-noise ratio. The MT 71 S guarantees a particularly clean and colourless sound reproduction. lt is well suited for instrumental and vocal soloists in radio and television broadcasting and for accurate productions. The pressure gradient transducer is a dual capacitor design using a single brass back plate and two large diameter gold plated plastic membranes. The cardioid pattern exhibits a smooth treble boost rising which peaks at about 4 dB in the range of 7 kHz. This response coupled with a slight roll-off at low frequencies is what gives the microphone its legendary "presence". The direction of maximum sensitivity is radial to the grill, i.e. side addressed.

The transformerless circuit design substitutes the previous transformer by a symmetrical output stage yielding superb transient response combined with high RFI rejection. The circuitry also achieves wider dynamic range by lowering the self noise floor and increasing the headroom for loud signals. A 10 dB attenuator is installed to reduce the sensitivity of the microphone when placed near extremely loud sound sources. And, a low frequency roll-off switch will reduce the proximity effect when dose miking. The microphone is equipped with a 3-pin XLR connector fitting to a microphone cable, e.g. C 70.

The MT 71 S uses 48 volt phantom powering according to the international standards DIN 45596 and lEC 2 68-15.

Microtech Gefell

About Manufacturer

Since its founding by Georg Neumann in 1928, the company has produced high quality, condenser microphones for broadcasting and recording. Many models have used the M7 capsule originally designed by Mr. Neumann in 1949 for the CMV563a. The M7 was responsible for the legendary sound of the Berlin manufactured U47, U48 and M49 microphones. Today, under the technical supervision of Mr. Kuehnast's son, the Company still produces the M7 capsule in exactly the same way Mr. Neumann taught the elder Kuehnast in the 1940's. Hand drilling each hole in the backplate, making the PVC membrane, and even gluing it together by hand is done just as Mr. Neumann specified. The M7 is currently used in the UM 92.1S, UMT800, UMT70S and MT71S Gefell manufactured microphones.

Some of the production equipment which Microtech Gefell GmbH uses for capsule production capitalizes on advanced technology developed by the Soviets before Perestroika. One of the more recently developed microphones, the M300, uses a capsule made of ceramic material molded under high pressure and plated with chromium. This technology was developed in Moscow using advanced computer modeling and simulation techniques. Gefell perfected a capsule manufacturing process unlike any employed in making Western microphones.

The SMS70 series of microphones designed in the early 1970's used a hybrid amplifier with an fet stage. Hybrid technology was not adopted by manufacturers of Western microphones until the late 1980's. Microtech's newest amplifier for the UMT70S series microphones uses surface mount device (SMD) technology.

The company also manufactures a complete line of measurement microphones equivalent to those of Bruel & Kjaer, the Danish manufacturer. These microphones are tested to the highest standards currently used in the West. The manufacturing methods for the nickel membranes and backplate assemblies are highly advanced. Testing each microphone takes a minimum of three months to guarantee performance and stability when it leaves the factory.

Before the Reunification of Germany the company manufactured their studio and broadcast microphones for RFT, a state agency that distributed them to customers in the Eastern Bloc. Most of the microphones went into the broadcast system. Some microphones, like the PM 860, went into public address systems. Virtually every town hall and auditorium in the former Soviet Union has one. About 1985, the Company began developing high powered (30 to 100 Watt) industrial lasers. They still use a laser engraving machine to put the name and serial numbers onto microphones and other finished metal products. During this period, the East German government poured 60 Million Ost Mark into the company allowing them to buy sophisticated equipment and construct a new building.

Specifications


*Polar pattern:cardioid

*acoustical operating principle:Pressure gradient transducer

*Frequency range:40 ... 18000 Hz

*Switch position "reduced bass roll-off" at:90 Hz -10 dB - 1 dB

*Sensitivity at 1 kHz:13 mV/Pa - 3 dB

*Rated impedance:150

*A-weighted:80 dB

*Max. SPL for THD:0,5 % 134 dB with 10 dB preattenuation 144 dB

*Total dynamic range of the microphone amplifier:120 dB

 

Downloads

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Description

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Polar Pattern High Freq

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Frequency Response Curve

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Polar Pattern Low Freq