Josephson C617SET

The Josephson C617 Set is the second generation of our interchangeable capsule high voltage omni 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 standard "half inch" microphone capsules from a variety of international manufacturers.
Frequency response is flat +0, –1 dB from 10 Hz to 100 kHz.
The dynamic range is set by the limits of the physics of the microphone capsule and the electrical power available from a phantom power source.
The microphone effectively contributes no noise to the self-generated noise of a typical halfinch or bigger capsule. Using a 50mV/Pa capsule like the Microtech Gefell MK221 shown, this results in an equivalent electronic noise level of less than 9 dB SPL, "A" weighted.
The C617 has linear output up to about +9 dBV unloaded or about +7 dBV with a 1KΩ load, 20 Hz – 20 kHz. This corresponds to 127 dB SPL with a 50 mV/Pa capsule, or over 151 dB SPL with a 1/4" lab capsule.
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, these specifications together with a sub-micron 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.

The C617 is suitable for use only with high voltage metal diaphragm instrumentation capsules such as Microtech Gefell, original Brüel & Kjaer, GRAS or ACO Pacific DC polarized types. A variety of these capsules are available from Josephson. Standard 0.460x60 threads are provided for "half inch" capsules. Other size capsules may be used with adapters. Low voltage or electret capsules should not be used with the C617.

Josephson C617 Set Specifications :

    * Frequency Response: 10 Hz – 100 kHz +0, -1dB
    * Equivalent noise level: <2.5µV A-weighted, <6.5µV CCIR quasi-peak
    * Gain:2.5 dB (balanced symmetrical direct coupled output)
    * Maximum output level: +7dBV for <1% THD, 1kΩ load
    * Output impedance: 50Ω (minimum load impedance 1kΩ)
    * Power requirements: P48 phantom per IEC 61938, <5 mA
    * Capsule polarize: 200V
    * Temperature Range: -10 to +50°C
    * Dimensions: 21mm diameter 165mm long (less capsule)