Josephson C617 Set (MK221)

Omnidirectional microphone, 200V polarized, with Microtech Gefell MK221 capsule

The Josephson C617 is the second generation of our high voltage metal diaphragm
omnidirectional microphone, suitable for the most critical sound recording and
measurement applications. It operates from standard P48 phantom power yet provides
full 200 volt polarize potential for a lab grade standard “half inch” microphone capsule.

The C617SET is supplied with a Microtech Gefell MK221 capsule. The dynamic range is
dependent on the inherent noise of the microphone capsule and the limits of P48
phantom power. The Josephson cascode FET front end circuitry introduced in the C606
is further refined in the C617, combined with our traditional balanced bipolar class-A
symmetrical output stage.

For music recording, the Josephson balanced symmetrical circuitry together with a submicron
thickness metal diaphragm capsule translate to the purest, most open sound
possible. Pickup of sound pressure alone results in no proximity effect, very low sensitivity
to wind noise, and phase accuracy that cannot be obtained with directional
microphones. Spot-miking applications or overall stereo pickups using spaced pairs take
on a new level of detail and precision not possible with other types. The small capsule
size results in a nearly perfect omnidirectional pattern for accurate pickup of the whole
acoustic environment.

Specifications of C617SET
Frequency Response 10 Hz – 20 kHz ±1 dB
Equivalent noise level 14 dB SPL, A-weighted
Sensitivity 66 mV/Pa (-24 dB ref 1V/Pa)
Maximum output level +7dBV for <1% THD, 1kΩ load (127 dB SPL)
Output impedance 50Ω (minimum load impedance 1kΩ)
Power requirements P48 phantom per IEC 61938, <5 mA
Temperature Range, -10 to +50°C
Dimensions 21mm dia, 176mm long (with capsule)
Weight 120g