User's manual
Bock Audio model 5-0-7
1) description
2) additional circuit notes
3) getting started
4) power supply and cable
4) safety warnings
5) specifications
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1) The Bock Audio model 5-0-7 is a high quality cardioid directivity studio condenser microphone
utilizing vacuum tube electronics and a unique elliptical capsule. Utilizing the U47 format, originally
built in the 1950's, this mic takes that platform and expands the electronics and capsule bandwidth. It
utilizes it's own proprietary cable and power supply. The microphone's audio output is standard male
XLR3, with positive excitation of the diaphragm at the front of the mic resulting in a positive voltage at
the output XLR's pin 2. Audio output is fully transformer balanced.
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2) The Bock Audio 5-0-7 uses classic pentode run as single triode circuitry with no additional negative
feedback and high quality through hole components. Through hole components are more mechanically
robust than surface mount and allow for worldwide ease of repair. Single triode mic circuits demand
excellent capsules before them and excellent transformers after them, with a reward of low noise,
simplicity of troubleshooting, and classic sound unachievable otherwise. In addition this mic utilizes
fixed cathode bias derived from the heater, as the original U47 did. The Bock 507 departs from the
classic U47 of the 1950's in it's expansion of the bandwidth of the electronics, which has had it's low
frequency cutoff frequency decreased from 40Hz to 10Hz, without any loss of high frequencies, by use
of a larger value grid resistor.
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3) It is recommended that the user place the mic in it's shockmount on a stand and connect all the
cables before applying power to the unit. Allow a few minutes for the mic to warm up.
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4) The Bock Audio N470 full linear power supply features simple choke fed shunt B+ regulation. The
outputs and cable pinouts are:
1)
audio (-)
2)
audio (+)
3)
pattern (if applicable)
4)
heater (5.9v typical)
5)
B+ (120v typical)
6)
ground
case) shield
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5) CAUTION: Shock Hazard: Do not open microphone or power supply when connected to power
source. No user serviceable parts inside. Refer failed units to qualified service personnel.
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VORTICHT: Shock gefar: Bitte nicht daf mikrofon offen wenn es eingeschaltet ist einen stoppkontakt.
www.bockaudio.com
818-506-1870
