Microtech Gefell UM92.1S and M92.1S Tube Mic 

The Microtech Gefell UM92.1S is a vintage large-diaphragm multi-pattern microphone with switchable back-diaphragm voltage on the power supply for choice of figure-8, cardioid and omni-directional patterns. It is also available in a cardioid-only version called the M92.1S. These are handmade vacuum tube microphones that are ideally suited for voice, instrument and orchestral work for studio, live recording and broadcast. The design has been optimized for minimal disturbance while yielding excellent sensitivity and low noise.

Each is equipped with a M7 capsule. This pressure gradient transducer features a dual-membrane, gold evaporated PVC capsule that is still handmade in the Microtech Gefell factory. All M7 capsules are hand-selected for optimum frequency and polar response. The result is a softer and rounder rendering that smoothes out the voice producing unmatched warmth.

As with all Microtech Gefell microphones, mechanical and electrical attributes have been optimized for performance. Careful attention to reducing vortex around the mic and capsule is achieved by mounting the M7 capsule on a triangulated pedestal. This has the benefit of directing unwanted reflections away from the capsule, reducing comb-filtering and phase disturbance.

A natural presence rise provides added clarity and detail on-axis, while the off-axis transition is both smooth and musical. The habitual low-frequency proximity effect provides a warm bottom end that is enhanced as the source is brought closer to the diaphragm.

The internal low-noise vacuum-tube amplifier features a high-mu triode valve that has been selected for its warm sonic characteristics and the natural even-order overtones. For long cable runs, a filament voltage stabilizer is built into the microphone that allows distances of up to 328 feet without fluctuation.

The M92.1S and UM92.1S comes equipped with the EA92 deluxe elastic suspension to reduce vibration-borne noise from affecting the microphone. The suspension is secured to the base of the microphone by way of the screw-on, machined housing. This allows these mics to be positioned at any angle without worry.

Both come equipped with its own power supply. The power supply provides the polarization voltage for the capsule as well as DC voltage for the microphone amplifier. It features a selectable fuse housing that allows both 110V and 220V operation. All connections are made on the rear panel. A 6-pin Tuchel connector and cable, which powers the microphone, is supplied. Output is balanced 3-pin XLR.

The complete system includes the UM92.1S or M92.1S mic, UN920.1 power supply, EA92 elastic suspension, C92.1 cable, W92 windscreen (UM92.1S only) and a handcrafted wood box. A dark bronze finish may be custom ordered.