Microtech Gefell UM 70 MV 692 - XLR - 48V 1970S

COMPLETE MULTI-PATTERN CONDENSER SYSTEM – FACTORY 48V XLR

This listing is for a complete Gefell system, carefully assembled around an immaculate UM70 capsule and a time correct - Vintage Gefell MV 692 amplifier, both in exceptional condition.

Beyond rarity and aesthetics, this microphone stands out for one simple reason: it is reference-grade.

If someone ever wants to know what a UM70 should sound like, this exact system is the answer. with perfectly transparent FET Time-correct vintage amplifier for correct UM70 polarisation.

Visually, mechanically, electrically, and sonically. It is exciting to hold, exciting to listen to, and deeply satisfying from an engineering perspective.

OPTICAL CONDITION

UM70 Capsule - serial number: 5581

Absolutely immaculate condition . No scratches, no marks, no wear Visually flawless and exceptionally well preserved

MV 692 Amplifier - XLR 48V

excellent optical condition. One or two tiny, superficial marks on the body only - Connectors look virtually unused and as new. Overall preserved

TECHNICAL CONDITION

MV 692 Amplifier

Fully functional and thoroughly tested. Extreme low noise, Stable operation, All switches operate perfectly. This example has been factory converted to XLR and 48V phantom power by Gefell

Capsule :

Pattern switching is clean, and consistent — healthy capsule. 100%

THIS ITEM INCLUDES

• Gefell UM70 multi-pattern capsule (original capsule, original patterns)
• Gefell MV 692 amplifier body
• Original UM70 capsule box
• Custom protective case

BUILD AND DESIGN

The MV 692 features a slim, precision-machined cylindrical metal housing with a clean, utilitarian design typical of professional broadcast equipment. The body provides excellent mechanical stability and effective shielding against interference. Capsule threading and internal mounting points are engineered for precise alignment and long-term durability. The 692 also features a low cut and a 10 db switch.

CAPSULE INTERFACE
The amplifier is compatible with the full range of Gefell screw-mount capsules, including the M70, the  M94, and related variants. The modular interface allows the sonic character of the microphone to be defined almost entirely by the capsule choice, while the amplifier remains electrically neutral.

The MV 692 uses a discrete FET solid-state  AMP design optimised for:

• Low self-noise
• Linear frequency response
• High electrical stability
• Reliable operation in continuous professional use

Intentionally transparent,  This PRE is preserving the capsule’s transient behaviour and frequency balance without coloration.

Capsule

The UM70 is a dual-diaphragm, large-diaphragm condenser capsule operating as a pressure-gradient system. Pattern selection is achieved through polarization of the front and rear diaphragms rather than acoustic switching.
Key construction features include:

• Dual diaphragm design for multi-pattern operation
• Omnidirectional, cardioid, and figure-8 polar patterns
• Classic Gefell backplate geometry
• Precisely machined capsule housing for modular mounting

Compared to later capsule designs that emphasize pronounced presence boosts or extended high-frequency lift, the UM70 remains conservative and controlled. Its polar patterns are stable and predictable, and pattern transitions do not introduce abrupt tonal shifts — a crucial attribute for stereo and room recording.

TECHNICAL SPECIFICATIONS

• Type: Large-diaphragm condenser microphone system
• Polar patterns: Omni / Cardioid / Figure-8
• Power: 48V phantom power
• Output: Balanced XLR
• Features: Low-cut filter, –10 dB pad

SOUND CHARACTERISTICS

neutral excellence sounds like. quiet and dramatic close position

The microphone is open, balanced, fast, and deeply controlled. No exaggerated coloration, no artificial sheen — just clarity, depth, and authority. It takes EQ beautifully, handles dynamics effortlessly, and stays composed even on demanding sources.

Equally at home on:

• Vocals
• Piano
• Acoustic instruments
• Room and ambient recording
• Stereo or MS applications

FREQUENCY RESPONSE

43 Hz – 17,800 Hz

• Exceptionally flat and balanced midrange
• Natural presence without harshness
• Clean low end with excellent definition

Systems like this simply do not appear often — especially not in this condition.
This microphone is exciting in the truest sense: to look at, to handle, and to listen to. It represents the very best of Gefell engineering and capsule design, preserved at an almost unbelievable level.

If you are looking for a true UM70 reference, this is it.

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