Universal Audio BOCK-251 Tube Condenser Microphone TGF33

Mint, Perfect, Open Box with Full Universal Audio Warranty

Universal Audio Bock 251 Tube Condenser Microphone
The UA Bock 251 is the flagship large-diaphragm tube condenser microphone from Universal Audio. Inspired by the legendary ELAM 251, widely regarded as one of the finest vocal microphones ever made, this mic combines timeless tube warmth with modern sonic flexibility. Handcrafted at the UA Custom Shop in Santa Cruz, California, by David Bock, the 251 delivers rich, open, and harmonically complex recordings, making it a centerpiece for world-class studios.

Features

• Premium large-diaphragm tube condenser mic, handmade in Santa Cruz, California
• David Bock’s interpretation of the iconic ELAM 251 design
• German-made CK12 capsule with dual asymmetrical backplate
• Cinemag transformer for extended low-frequency response and higher SPL handling
• Switchable polar patterns: omnidirectional, cardioid, and figure-8
• NOS ECC85 tube for classic warmth and harmonic richness
• Frequency response: 10 Hz – 18 kHz (±2 dB)
• Max SPL: 118 dB SPL @ 1% THD
• Dynamic range: 100 dB, with a 76 dB signal-to-noise ratio
• Includes premium vintage-style suitcase, UA Bock 251 PSU, and professional shockmount

Reach Sonic Nirvana
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.

Specifications

General
- Type: Tube condenser microphone
- Capsule: 1" dual diaphragm, CK12 type
- Polar Patterns: Switchable (Omnidirectional, Cardioid, Figure-8)

Electronics
- Tube: NOS ECC85
- Transformer: Cinemag
- Controls: Polar pattern selector
- Power Supply: UA Bock 251 PSU (true linear, 115V default / 230V optional)

Performance
- Frequency Range: 10 Hz – 18 kHz (±2 dB)
- Sensitivity: -34 dB (19 mV) ref 1V at 1 Pa, 1 kHz
- Max SPL: 118 dB SPL (1% THD)
- Dynamic Range: 100 dB
- Signal-to-Noise Ratio: 76 dB

Impedance
- Output Impedance: 150 Ω
- Recommended Load: > 1.2 kΩ

Physical
- Weight: ~12 lb (5.4 kg) [with PSU/case]
- Finish: Studio-grade handcrafted build

Connectivity
- Microphone: Tuchel connector
- PSU Output: 3-Pin XLR

Included Accessories
- Vintage-style storage case
- Professional shockmount
- UA Bock 251 hand-tuned power supply