RCA KU-3A Vintage Ribbon Velocity Microphone RARE

Description: Vintage RCA KU3A - MI- Velocity Ribbon Microphone - Restored & TestedVery Good/Excellent Cosmetic Restored ConditionThis mic was very clean internally and only required outside paint to body & grilleNew Grille clothRibbon was in good shape and workingNew Cable with Amphenol Connector to XLR MaleWhen we purchased this it had no yoke/holder stand mount - this is a Rycote Invision Model USM, which is the largest they make and just fits this mic.Note: This mic like most vintage Ribbons requires a very robust Mic Pre Amp with plenty of gain.( NO PHANTOM POWER)I read on several studio and audio sites, that this RCA model (KU#A) is little light on the low end and I would say that is true. I also read some of the mic gurus, like Stephen Sank and Luke at ENAK have ways of getting more bottom when the do a ribbon replacement, not sure about that, I have also read these vary from mic to mic on the bottom end.They made very few of this model so they are rare.Below taken from COUTANT Website Description The Type KU-3A Unidirectional Microphones were designed to meet the exacting requirements for sound-film recording at motion-picture studios. These microphones provide uniform and smooth reproduction over a wide audio range (suitable for dialog and music), and have the unidirectional pattern considered so desirable for sound-motion-picture applications. The exhibit a high sensitivity for sound originating in front. Rejection (cancellation) at the back is such as to provide a new low in output of unwanted signal. The light weight, small size, rugged construction, and attractive appearance of the units make them outstanding in their field.These microphones are of the type in which the moving element is a single thin extremely light corrugated metallic ribbon. The ribbon is suspended in an air gap between the poles of a permanent magnet, so as to vibrate freely with a motion corresponding closely to the motion of the air particles of the sound wave striking it. The voltage generated as the ribbon cuts the magnetic lines of force is the electrical equivalent of the velocity of the particles of the sound waves. An acoustical labyrinth formed in the cylindrical section of the microphone below the magnet and pole-piece assembly is coupled to the air gap by a tubular connector. This connector is sealed to the rear of the air gap, and contains a small silk-covered opening in the plate at the rear. The cloth-covered opening is of suitable dimensions to provide a unidirectional response characteristic for the microphone. The ribbon and magnet assembly are enclosed in a cloth-lined perforated-metal grille assembly which provides protection against mechanical injury, dust, and to a certain extent wind. The hemispherical shell below the acoustical labyrinth covers an impedance-matching transformer with output taps for 30, 150, and 250 ohms impedance. A three-pin output receptacle (male) is mounted on the shell, and 180-degree rotation of the shell is possible as a means of changing the output receptacle location.The microphones are finished in a flat two-tone umber gray. A three-fourths inch white reference stripe on the back of the grille assembly is provided as a “panning” guide to the boom man, to indicate the “dead” side of the microphone.

Price: 8495 USD

Location: North Bend, Oregon

End Time: 2024-10-11T18:17:33.000Z

Shipping Cost: 60 USD