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Gefell UMT 70 S FET Microphone  From Gefell

Large diaphragm, transformerless multi-pattern studio microphone

Microtech Gefell


Retail:  $2,200.00

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Manufacturer's Description from Gefell

The Gefell UMT70S is a multi-pattern FET microphone that features the legendary M7 dual-membrane, gold evaporated capsule with a new, state-of-the-art low-noise capsule amplifier for exceptional transient response, wide bandwidth and a natural uncolored sound. The ultra-slim design benefits the UMT70S with less acoustic field disruption around the microphone and greater placement ease when lose micing instruments. The UMT70S is ideal for recording, broadcast, voice-over and live sound reinforcement.

Design Features

The Gefell UMT70S features a stylized slim-body design with a flared head that houses the capsule and the "super-cool" pattern selector switch. This diminutive design reduces sound pressure build-up and subsequent "vortex" around the mic while making placement easy when close mic'ing instruments.

Inside, mounted on Gefell's unique triangulated pedestal is the legendary M7 capsule. The Gefell M7 is a pressure gradient transducer, renown for its warm and natural tone. It features a dual 1-inch (25mm), 24-karat gold evaporated membrane design with a PVC substrate. The M7 is considered by many to be the finest capsule ever made. The triangulated capsule pedestal deflects unwanted body reflections away from the microphone, reducing phase cancellation and comb-filtering. This of course benefits with greater source detail, improved upper-harmonic reach, and a more articulated rendering.

With the advent of digital recording and digital broadcast, the demand for improved performance set the path to upgrade the UMT70S circuitry. The introduction of a new transformerless preamplifier with a symmetrical output stage benefits the microphone with a significant reduction in self-noise, a broader and more uniform frequency response, and an explosive transient response that is capable of 149dB.

The UMT70S features a precision-machined pattern selector switch below the capsule grill that is rotated to select between the omnidirectional, cardioid and figure-8 polar curves. Mid-way down the body stem are controls for the 10dB pre-attenuation pad and the smooth low-frequency roll off (-10dB@90Hz).

Using the UMT70S

As a large diaphragm microphone, the Gefell UMT70S produces a warm full-bodied sound that is both natural and uncolored. With exceptionally good on and off-axis response, the side-address UMT70S is equally at home in the studio or in a live recording environment. In the omnidirectional mode, a ruler-flat bottom end is combined with a slight 2dB rise in the 10kHz region making the UMT70S ideal for ambient recording and orchestral works. In the cardioid and figure 8 modes, the UMT70S is voiced with a smooth presence rise in the 7kHz region. This response, coupled with a slight low-frequency roll-off gives the UMT70S its legendary "shimmer" making it a great choice for voice-over, solo vocal and instrument. When close micing, activating the low-frequency roll off gently curbs unwanted rumble and tightens bass by controlling proximity build-up further adding to the UMT70S flexibility.

To reduce noise caused from vibration, the EA21 elastic suspension is recommended. The "clamp-style" microphone retainer inside the elastically suspended basket provides a safeguard against damage allowing the mic to be used at all angles. Hook-up is simple with a standard 3-pin XLR cable and 48V phantom powering.


By combining the famous M7 capsule with an improved low-noise power supply, Gefell has once again set a new level of performance in a full bandwidth studio microphone.

The combination of three well behaved patterns, greater sensitivity, exceptional signal-to-noise, above average transient response and a wide, noise free bandwidth housed in a compact body make the Gefell UMT70S a true "desert island" microphone.

The accurate and colorless sound of the UMT70S opens the door to greater creativity and freedom, making it a superb choice for recording and particularly well suited for instrumental and vocal soloists in radio and television broadcast. Comes in it's own beautifully hand-crafted wood box.


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.


Pattern: Omni, cardioid, figure 8 *Response:40Hz ~ 18kHz

Sensitivity: 13mV/Pa (cardioid pattern)

Level / Roll off: -10dB pad / -10dB @90Hz

Self noise: 14dB-A

Signal to noise: 80dB-A

Maximum SPL: 149dB with 10dB pad

Dynamic Range: 120dB

Power requirement: 48V Phantom