Josephson C725, Руководство пользователя

Страница: 5 / 5

JOSEPHSON ENGINEERING • C725 USERS GUIDE
EF86, EF806 or 6267 type. Small variations expected over the life of a tube are automatically
compensated by the circuit. Silicone rubber dampers are provided around the tube and must be
replaced on the new tube; they control vibration and also protect the tube if the microphone is
dropped. Be particularly careful when replacing the tube to not touch the front-end FET circuit
which is found on two PTFE (Teflon) standoffs near the tip of the tube envelope. This area must
remain absolutely clean or additional noise may be created in the circuit. The two small resistors
there have a value of 3,000 megohms and are sensitive to surface contamination.
Do not open the power supply, hazardous voltages may be present inside even after it has been
switched off. There are no user-serviceable parts inside.
Specifications
Transducer type DC-polarized pressure/pressure gradient condenser element
Rated power supply 100-130 or 220-240 V 50/60 Hz AC, 30 watts
Impedance 150 ohms nominal, balanced floating
Minimum load impedance 1500 ohms
Sensitivity 25 mV/Pa (

) or 8mV/Pa (

)
Frequency Response 20 Hz - 20 kHz ±2 dB from reference
Directional pattern omni/subcardioid/cardioid/hypercardioid/figure-8
Max. permissible sound pressure 165 dB SPL
Overload sound pressure 134 dB SPL (

) 144 dB SPL (

)
Equivalent SPL due to noise <18 dB SPL (A weighted rms,

)
Dimensions 63 mm diameter (100 mm wide at yoke), 261 mm long
Output connector Modified 12-pin Binder 691 series to power supply, XLR-3 at supply
Power supply output voltage B+ 150V, A- 9V, Vpol 0-120V
Made in USA
Warranty
Josephson microphones are warranted to be free of defects for five years from the date of original
purchase. If purchase documents are not available, the warranty period begins when the
microphone was shipped from the factory. Josephson Engineering will, at its option, repair or
replace any microphone that fails, providing that it is returned to the factory prepaid and has not
been abused or altered. For service information please contact Josephson at 831-420-0888.
Repair shipments may be sent to: Josephson Engineering, Inc., 329A Ingalls Street, Santa Cruz
CA 95060
Certification
Josephson Engineering, Inc. certifies that the C725 microphones bearing the CE mark conform to
the applicable requirements of the European Union directives as follows:
Machinery 93/68/EEC
Exempt – passive sensor
Low Voltage 93/68/EEC Exempt – passive sensor
EMC 93/68/EEC Exempt – passive sensor
Safety EN 60065:2002
RoHS 2002/95/EEC Compliant for Hg, Cd, Cr6, PB, PBDE and Pb