REFURBISHED UHER 612 CRYSTAL 1960S XLR

one of the most unique transducer technologies ever used in audio. Crystal microphones, popular in the mid-20th century, use piezoelectric materials to convert sound into signal directly, resulting in extremely fast transient response and a highly detailed, articulate sound. The UER Type 612 is a beautiful example of this approach — lightweight, functional, and unmistakably characteristic.

OPTICAL CONDITION

Very good used condition.

The white plastic housing is clean and well preserved, with only minor signs of age. The golden internal mesh remains bright and visually striking, and the folding metal support legs are intact, straight, and fully functional. The microphone presents beautifully, with its original retro design fully intact.

TECHNICAL CONDITION

Refurbished - internal foam changed

Working

BUILD & DESIGN
The Type 612 features an extremely lightweight molded plastic housing in white, giving it a distinctive and elegant appearance. The golden internal mesh protects the capsule while adding visual depth and contrast.The microphone does not include a threaded mount option

Capsule
This microphone uses a crystal capsule based on piezoelectric material. Crystal transducers are known for their extremely fast transient response and high level of detail, while naturally producing less low-frequency content compared to dynamic or condenser microphones.

Circuit
Passive piezoelectric crystal transducer with high-impedance output. No external power required.

TECHNICAL SPECIFICATIONS

Type: Crystal microphone
Polar Pattern: wide cardioid
Frequency Response: Estimated 180 Hz – 13,000 Hz
Mounting: Integrated folding table legs
Output: Unbalanced, high impedance

SOUND CHARACTERISTICS

The Type 612 delivers a highly detailed and articulate sound with exceptional transient clarity. High frequencies are open and precise, capturing subtle acoustic detail with ease.

Low-frequency reproduction is limited, resulting in a lean tonal imbalance with very little warmth. This creates a naturally filtered sound that can be very useful for emphasizing articulation and presence.

Crystal microphones offer a truly unique sonic character, functioning like an acoustic filter that highlights detail and texture in a way few other microphone types can replicate.

Moderate self-noise is present, which is normal for this transducer technology.

FREQUENCY RESPONSE

Estimated Frequency Response: 150 Hz – 10,000 Hz

• Limited low-frequency extension
• limited midrange clarity
• Excellent transient detail
• high-frequency presence

SUMMARY

The UER Type 612 is a beautiful example of German crystal microphone design, combining innovative materials with a distinctive sonic signature. Its extremely lightweight construction and integrated stand make it both visually and functionally unique, while its crystal capsule provides a sound character unlike conventional microphone technologies.

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