Used Josephson C617 Pair, C617sets with Mk221 Capsules  From Josephson

Like-new, Mint condition with original packaging, protective mic pouches, wooden capsule boxes, and mic clips. These immaculate microphones come from a single owner and were stored in an air-conditioned dust-free environment.   These are only sold as a Pair


Our product photos are the actual, specific serial number for sale!

This specific item was photographed by us here in Durham, North Carolina. We are a very small team dedicated to providing you the most accurate photos possible, through our obsessive focus - individually photographing nearly everything that comes through the door. Questions about what you see? Want more information, photos, or just a friendly conversation with someone that cares and who has actually had their hands on this exact item? Contact us now!

Buy Pre-owned from Sound Pure with Absolute Confidence

Sound Pure's dedication to pre-owned products is unprecedented in the industry. We are a small team of dedicated experts that buys, trades, and consigns. We are trusted by customers all over the world. Our curated collection, is thoroughly tested and inspected by some of the best in the business. Our inventory is constantly changing, ever-evolving, with some items sold before reaching the website. Looking for something specific? Have questions about this product's condition or history? Want more photos, or to simply chat with an expert who's had his hands on this actual piece? Contact us now.
Our Current Used/Vintage Collection »

Sound Pure's Consignment Program »

Luthier Certification for Used Instruments »

Josephson Engineering

"Gone, Baby, Gone"

This one is sold. Don't miss the next one. Some things never even make it to the site so stay up to date on our used collection.

We get in many oddities, rare and vintage products, most of which go fast. If you're on the hunt for something specific, something unique, or something priced right, let us notify you on our used collection before the items even hit the site.

Want to know if one lands?

Notify Me

Want to discuss what's coming?

What We Think

Honesty and detail are what this mic delivers! Josephson has married the Geffell omni 221 capsule with their own high-voltage body to give you the most detailed omni mic in the world! Also, you don't need a high-voltage mic pre - the magicians at Josephson have made their 200 volt amplifier body work on any standard 48 volt phantom power! The MK221 capsule is incredibly rigid, which is what offers so much detail and accuracy. Combined with the high-voltage body, the 617 is perhaps the most detailed omni-directional microphone we've ever experienced!


Josephson C617 Omnidirectional Microphone - Interview w/ David Josephson at AES 2011

The C617 from Josephson Engineering is high voltage metal diaphragm omni mic. This powerful microphone provides extremely detailed and clean sounding recordings on a wide variety of applications. In this video, Todd discusses with David Josephson the technology behind the microphone as well as the special Microtech Gefell MK 221 capsule made specifically for the C 617s. Watch our other interviews with the Josephson crew at AES 2011. We have videos on the new SPB40 baffle for the C617 microphones as well as an interview on the new C716 and the unique grill featured on the 716. For more information about these products, visit or give us call! 919.682.5552.

Manufacturer's Description from Josephson

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 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.

Josephson Engineering

About Manufacturer

Josephson Engineering makes a wide range of fine condenser microphones for studio, stage and field sound pickup, and audio instrumentation. The company began in San Jose, California in 1988 and moved to Santa Cruz in 2000. This is our 20th year of producing microphones. In the process of developing our own mics, we've come up with special technologies that let us realize designs that weren't possible in classic mics of years past. This means that the expert user has a wider range of sound choices, without many of the compromises of older designs. Besides our own production, we also supply microphone capsules to several other mic manufacturers that become the mics for their most demanding customers. All of our business is individual -- we use select local dealers who bring our product directly to critical users around the world. We have a standard product line that covers many applications, but if there's a microphone you need that we don't make, we'll either tell you about the best one we know of for that job, or make it for you ourselves. We won't tell you that one of our mics is good for everything -- there's no such thing. Josephson also provides electro-acoustical engineering, design and manufacturing services for challenging requirements in many industries, specializing in microphone transducers and supporting systems. Our OEM capabilities have allowed several companies to excel in their own markets, using capsules made by Josephson.


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


Specifications of C617 body alone, for use with other capsules, as above except:

Frequency Response: 10 Hz – 80 kHz ±1 dB

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)

Capsule polarization: 200V

Dimensions: 21mm dia, 165mm long (with capsule)

Weight: 110g