Universal Audio UA Bock 251 Tube Condenser Microphone w/PSU

About: Universal Audio UA Bock 251 Tube Condenser Microphone w/PSU

The UA Bock 251 is our flagship large-diaphragm tube condenser mic, giving you the smooth, open tone of the iconic ELAM 251,* considered by many to be the greatest vocal mic ever made. Each microphone is handmade in Santa Cruz, California, to the exacting specifications of world‑renowned mic designer David Bock.

Add Handmade Magic to your Studio

The UA Bock 251 is David Bock's loving interpretation of the classic 251 microphones he studied and maintained as chief technical engineer of the world's top recording studios for two decades. Handbuilt at UA’s Custom Shop in Santa Cruz, California, the UA Bock 251 mic puts "golden unit" sound at the heart of your recordings.

Rich Tube Mic Sounds, with Updated Sonics

With its German-made CK12 capsule and large output transformer, the UA Bock 251 gives you extended low‑frequency response down to 10 Hz and higher SPL capabilities versus vintage 251 microphones.

Built for a Lifetime of Harmonious Recording

Handwired using premium components, each UA Bock 251 is built and tested to David Bock's exacting specifications. With its vintage-inspired case, robust shock mount and accessories, this mic spares no expense to last a lifetime.

Features

• Large-diaphragm tube studio condenser mic, lovingly handmade at the UA Custom Shop in Santa Cruz, California
• Iconic, "golden unit" mic sounds with modern enhancements by David Bock 
• Switchable omnidirectional, cardioid, and Figure-8 polar patterns
• German-made CK12 capsule and Cinemag transformer
• Frequency Response: 10 Hz - 18 kHz, ± 2 dB
• Max SPL: 118 dB SPL, 1% THD 
• NOS ECC85 tube
• Requires included UA Bock 251 PSU true linear power supply
• Premium vintage-style suitcase

Specifications

• Microphone Type -  Tube Condenser
• Polar Pattern -  Multi-pattern
• Frequency Range -  10 Hz - 18 kHz, ± 2dB
• Sensitivity -  -34 dB (19 mV) ref 1V at 1 Pa, 1 kHz
• Max SPL -  118 dB SPL, 1% THD
• Output Impedance -  150 Ohms
• Recommended Load Impedance -  Greater than 1.2K Ohms
• Adjustable Controls -  Polar pattern selector for Cardioid, Omni, Figure-8
• Connector -  Tuchel (mic), 3-Pin XLR (power supply)
• Included Accessory
  • UA Bock 251 power supply, 100V, 115V (default), or 230V operation
  • Premium vintage-style suitcase
• Dimensions -  8.5” (216 mm) length, 2” (52 mm) diameter
• Weight -  1.58 lbs (716 g)