Bock Audio 251 Large-diaphragm Tube Condenser Microphone

Large-Diaphragm Tube Condenser Microphone with Power Supply and Spider Shockmount
Bock Audio 251 Large-diaphragm Tube Condenser Microphone image 1
Bock Audio 251 Large-diaphragm Tube Condenser Microphone image 1
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Bock Audio 251 Large-diaphragm Tube Condenser Microphone
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A Sought-after Vintage Tube Mic Reborn

The Bock Audio 251 large-diaphragm tube condenser microphone re-creates the sonic beauty of the fabled Telefunken ELAM 251, one of the most sought after vintage mics ever built. Formerly known as Soundelux, Bock Audio makes incredible high-end mics that faithfully re-create the sound of some vintage classics. The 251 has a strong, powerful bottom and airy, unabrasive top puts this mic leagues ahead of others; its performance simply cannot be found in cheaper microphones. You'll hear the difference immediately when you put this mic on vocals; for clarity, full sound, and premium handbuilt quality, the Bock Audio 251 simply can't be beat!

Bock Audio 251 Large-diaphragm Tube Condenser Microphone at a Glance:
  • Versatile applications
  • Handcrafted excellence
  • Bock Audio modern vintage

Versatile applications
Though it's primary use will undoubtedly be on male or female vocals, the 251 is an extraordinary performer on other instruments as well. Drum kits will have astounding impact and transient response, with no overt artificial high end or midrange boxiness. Pianos will also benefit from the open top of this mic. It will also excel on acoustic guitars, percussion, and as a main ensemble mic. The 251 manages to capture the vibe of the legendary Telefunken ELAM 251, staying true to that mic's performance specs and unregulated power supply.

Handcrafted excellence
Bock Audio microphones are handcrafted, with point-to-point wiring, time-proven transformer circuitry, and an attention to detail that truly brings the sound of prized vintage mics "back to life." Bock Audio doesn't compromise when it comes to components, construction, assembly, or testing. These mics are hand-tuned, using strictly tested European capsules and premium-grade electronics.

A note about Bock Audio:
Bock Audio (formerly Soundelux) is a unique US manufacturer of true "professional level" microphones. Their mission is to restore the availability of the most important vintage microphones of all time without the vintage price and without the high maintenance. Bock Audio works to re-create as closely as possible the sonic signatures of the most important vintage microphones, using modern materials and assembly, hand workmanship and a very critical ear. The beauty of Bock Audio is that every microphone in the line is designed to work together as a team. The Soundelux line up provides the most important "colors" proven over time to be essential in all quality studio work.

Bock Audio 251 Features:
  • No-compromise construction; hand built, hand tuned, strictly tested European capsules
  • Time-proven tube and transformer circuitry
  • All electronic components are point to point wired
  • Each individual component in every microphone has been pre-screened for sonic quality
  • Power supply is true to the original, unregulated supply
  • Excellent bass with an open, airy top end
  • High frequency response that is not only present, but natural, quality tone
  • Allows vocals to sound naturally dominant without being overbearing
  • No midrange overemphasis and buildup when stacking vocal tracks
  • No honkyness or grunge
  • Smooth, clear sound, even when recorded digitally
  • Sounds great in all mixing studios and on all systems, before and after mastering
The Bock Audio 251 breathes new life into a classic mic sound!

Additional Media

Studio Microphone Buying Guide
New in Stock at Sweetwater
Want to hear this mic in action? Listen to high quality samples in our vocal mic shootout!

Tech Specs

Microphone Type Tube Condenser
Polar Pattern Cardioid, Omni, Figure-8
Diaphragm Size 1" (25.4mm)
Frequency Response 10Hz-20kHz
Max SPL 129dB
Output Impedance 200 ohms
Signal to Noise Ratio 76dB (A weighted)
Self Noise 18dB (A weighted)
Color Grey
Connector XLR
Weight 1.58 lbs.
Included Accessories Power Supply, Cable, Shock Mount, Wood box
Manufacturer Part Number 251

Customer Reviews

Based on 6 reviews
Write your review

the Bock Audio 251, So beyond all others.

I've Been using the Bock 251 (Sound Deluxe 251) for the past 10 years and it is still my go to mic. I've been using it with a vintage lexicon 200 reverberator with stellar results. Unlike most, I record voice live with effects, and it is amazing the depth this mic delivers. It is absolutely true what they say, the bottom end is huge but defined, the high end is smoky with sparkle and it gives the vocal artist a whole new dimension to play in. If you can, you've gotta give yourself a break and test one of these baby's out.
Music background: Pro musician for 40 years, Studio Owner.


I've owned this mic for 4 years, and it's my go-to for everything from soul and reggae to punk rock. Sounds great on a well-made acoustic, as well as strings and horns. Hell, just put on some cans and try it on anything. Chances are it's going to sound stellar.
Music background: Producer, Recording Engineer, Teacher, Studio Owner

Bock 251 studio mic

I've owned the Bock 251 for just over three months now, used it on a several vocals/piano/sax/acoustic bass all through my Manley Vox box,... amazing quality, stunning. I can't imagine anything better, perhaps just as good but certainly not better, I've used the AKG C12, Rode Original Classic, Neuman U87,Royer Ribbons, all have a slightly different character as you would expect... BUT... the Bock 251 for me just fits into my studio perfectly,... I'm very proud to have such a piece of equipment. If you can afford it, you won't be disappointed.

Best Vocal Mic in the world...for me....

I've been in music for 30 years. I've used uncountable mics. My voice is male, and somewhat "leonard cohen" like, but I also have a "pretty side" that I bring out with certain songs. THIS mic is the FIRST one ever that captures what I try to do. The bottom end, the warmth, the articulation, the "feeling"---it all comes through with this mic. I was literally in tears listening to the first playback from this thing. It's all I'd hoped for and more. You may ask, is it worth it? The answer is a RESOUNDING "yes".
Music background: Pro Musician, Recordist, Songwriter

That Sound I bin Looking For Why So Easy

First of i like to say i was using a rode NT2A Microphone which work great for vocals but i wanted some thing more high end sounding so i called up sweetwater and talked to my sales rep Austin Moss and ask bout the bock Audio 251 cause i was hearing some many great things about this microphone he told me this microphone will get you that sound your looking for so i went ahead and got this bad boy and am happy to say this microphone really has that big sound airy highs up front mids and that full low end in a vocal i bin looking for i dont know what i do with out my bock audio 251 any one of there thinking about serious vocal quality get a bock audio 251 you wont forget the day you record with it.
Music background: Recording Engineer,Sound Engineer

Sweetwater Advice

Stuart Niven

The Bock Audio 251 is truly a modern classic, founded in essence on the epitome of classic vintage microphones, the ELAM 251, which is regarded to this day as "The Vintage Microphone" to have - IF you are fortunate enough to even be able to find an original! The 251 delivers a full low end and a present mid with an articulated but open top end response, warm and Full with a majestic brilliance! This is no ordinary microphone. If you are serious about your vocal microphone, this is where the buck stops! This is an essential microphone for anybody who needs high-end sonic character for their tracks. Not only for vocals! Anywhere where you need a perfect sonic fingerprint of your source! I do not want to record without a Bock ever again!

Joseph Secu

What a deal! Finding an original 251 today is nearly impossible and if you actually do find one, you'll most likely pay five-digit figures or more for it. To a collector or to any musician/engineer who won't settle for mediocrity, Bock has answered your dreams - and for a quarter of the price.
See also: Condenser Mics, Bock Audio, Bock Audio Condenser Microphones