Universal Audio Bock 251 Large Diaphragm Tube Condenser Microphone with PSU

Universal Audio Bock 251 Large Diaphragm Tube Condenser Microphone with PSU

The Universal Audio Bock 251 is a premium large-diaphragm, multi-pattern tube condenser microphone designed for professional engineers and recording artists. Developed by David Bock and handcrafted in Santa Cruz, California, this mic captures the timeless sound of the original 251 while incorporating modern enhancements for superior performance and reliability. Its switchable polar patterns—cardioid, omnidirectional, and figure-8—make it an indispensable tool for capturing vocals, instruments, and more with stunning detail and depth.

The Bock 251 features a proprietary C12-type capsule, a newly engineered transformer for expanded frequency response and headroom, and a true linear inductor-based power supply. Every unit is meticulously hand-calibrated to ensure “golden-unit” consistency, offering boutique quality that will last a lifetime. Complete with premium accessories, the UA Bock 251 is the ultimate choice for discerning professionals.

Key Features

• Legendary Design: Faithful to the iconic 251 with modern enhancements for superior reliability and tone.
• Premium Capsule: Proprietary all-brass C12-type capsule delivers unmatched clarity and warmth.
• Switchable Polar Patterns: Cardioid, omnidirectional, and bidirectional (figure-8) for versatile applications.
• Advanced Transformer: Newly engineered for increased frequency response and headroom.
• Custom Power Supply: UA Bock 251 PS ensures dynamic range and extends tube life.
• Handcrafted in the USA: Handmade in Santa Cruz, CA, with handwired components for durability.

Specifications

• Type: Large-Diaphragm Tube Condenser Microphone
• Tube Type: New Old Stock ECC85
• Capsule: 1″ diameter dual asymmetrical backplate (CK12 type)
• Polar Patterns: Cardioid, Omni, Figure-8
• Impedance: 150 Ohms
• Frequency Response: 10 Hz – 18 kHz
• Sensitivity: -34 dB (19 mV) ref 1V at 1 Pa, 1 kHz
• Max SPL: 118 dB at 1% THD
• Transducer Type: Condenser
• Power Supply: Linear inductor-based for optimal performance
• Package Includes: Microphone, shock mount, power supply, 20′ cable with Tuchel connectors, signature wooden box, retro-style suitcase

Applications

• Studio vocals and voiceovers
• Acoustic and electric instruments
• Orchestral and ensemble recordings
• Overheads and room miking