Download the Data Sheet
Includes 6 pin Tuchel cable, AC cable, wood box,
spider shock mount, and shipping system.
The vintage 251 is THE vocal sound people ask for, but the original (vintage)
versions are 50+ years old and sound very different from one another.
Repairing, rebuilding and “nursing” original 251’s
along has been David Bock’s work spanning over 30 years. The risk
for a modern studio or end user to depend on a vintage mic on a daily
basis is increasingly problematic.
The BOCK 251 is David Bock’s answer to the vintage mic dilemma
of getting “that sound” without the headaches. It is a premier
lead microphone for premier voices. It is built to last and provide the
studio and user with many years of daily, high end performance.
WHAT MAKES IT DIFFERENT?
The BOCK 251 provides the user with absolute confidence that this is
the mic you put in the most critical situations. The BOCK 251 uses a
proprietary hand made German capsule, a proprietary hand wound multi
sectioned audio transformer, a NOS tube in the mic amplifier, a hand
built outboard power supply and a custom low capacitance audio cable.
This is one of the best overall mic packages available on the market
at any price. The BOCK 251 is the ideal microphone to choose when there
is a variety of applications that must met with absolute top recording
quality. With frequency response that extends well beyond the normal
range of typical studio microphones, the BOCK 251 sets new standards.
For vocals, the BOCK 251 instantly delivers that huge vocal sound you
have wanted for years. It sounds equally impressive on females and males.
It will capture the most intimate and subtle details of a vocal yet maintain
integrity at high SPL’s. It holds up track after track, “sitting
on top” in extremely dense mixes without EQ.
For instruments, the BOCK 251 offers very high end performance on critical
stringed instruments, orchestras, choirs and small ensembles. The outstanding
transient response reveals elusive harmonic details that spell the difference
between good and great in your recordings.
HOW DO I USE IT?
The BOCK 251 cardioid pattern shuts off the back of the capsule to deliver
extraordinary vocals when worked very close. It is recommended to use
a pop filter on less experienced vocalists to enable closer working distances
to take advantage of the magical proximity effect. There is no low frequency
filtering used on a BOCK 251 so you will hear low frequency content you’ve
never heard before.
At distance, the BOCK 251 delivers a level of definition that is amazing.
The high end does not fade with distance like so many other condensers
and the power and depth of the low end response is a joy to hear. The
omni and Figure 8 patterns prove useful in these non-voice applications.
Patterns: Cardioid, omni, Figure of 8 Switchable
Frequency Range: 10Hz to 18kHz, +/-2dB
Equivalent Noise: 18dB (“A” weighted)
Distortion vs.SPL @1kHz:
112dB = 0.5% THD
118dB = 1% THD
129dB = 2% THD
(increasing distortion is non-exponential, nearly linear, and primarily
Impedance: 200 Ohms true transformer balanced
Recommended load: 1.2k Ohms
Dynamic range (maxSPL-"A"noise):
S/N (94dB-noise): 76dB “A”,
Capsule size: 1” diameter, dual asymmetrical
backplate CK12 type
Tube type: New Old Stock 6201
Dimensions: 2” dia x 8.5” oal
Weight: 1lb 9.3oz (1.58lbs) =716g
Shipping weight: 12 lbs
Power Supply: P251 true linear, factory
wired 115v or 230v operation
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advantages the 251:
1) True transformer balanced output using hybrid lamination four section
transformer*. Our transformer is ten times the size of the original so
you get no rolloff in the low end until 8Hz (with no loss of high frequencies),
making our mic more full bandwidth than the original.
2) NOS dual triode** with traditional resistive (not transistor) load and
enhanced original circuitry for unique vintage amplification curve and
3) Selected ck12 type capsule.
4) True linear power supply featuring choke fed, passive shunt regulated
B+ voltage and new super-quiet heater regulation, providing a better hum
and noise spec than the original.
5) Original headgrille dimensions and wire mesh layers are maintained for
faithful replication of classic 251 headgrille resonance effects.
6) Higher wattage resistors reduce noise effects due to heating inside
7) Shock mounted ceramic tube socket unlike any other in the industry reduces
in-band tube resonance & increases s/n while ensuring long trouble
8) Switchable three patterns on mic: omni, cardioid, fig 8. Cardioid completely
removes the rear membrane and it’s associated circuitry from the
signal path ensuring an optimized tone and s/n.
9) P251 power supply has power on indicators located at both ends for quick
and easy “power on/off” status verification.
*(four section transformers cost much more than
the common unsectioned or two sectioned device but have a greater
ability to resolve complex program material)
**(most NewOldStock tubes perform better than any currently made tubes
in microphones, and we have secured adequate stock for many years to come
and will not run into shortage problems like those seen with VF14’s