The Shure 330 Unitron/Uni-Ron
unidirectional ribbon microphone
Shure Model 330 with Shure Model S33B Desk Stand.
General
The Model 330 UNI-RON® is a compact and rugged unidirectional ribbon microphone combining wide range response and a supercardioid directional pattern. The microphone has been acoustically designed to suppress rear sound and provide a wide front pickup pattern. This polar pattern is somewhat more directional than the conventional cardioid, providing excellent control of unwanted surrounding noise and reverberation. The performance characteristics are ideal for studio use in broadcasting and recording and for critical sound reinforcement applications.
Figure 1—Frequency Response (30 to 15,000 Hz)
Microphone Features
- Unusually effective supercardioid pickup characteristic minimizes effects of studio acoustics and background noise
- Warm, smooth sound from wide frequency response range. Well suited to both voice and music
- Built-in shock mount for quiet operation
- Rugged mechanical design and internal ribbon protection for reliable performance, under rigorous operating conditions
- Instant switchable choice of three low impedances
Impedance Selection and Connections
The Model 330 may be connected in any of its three low-impedance positions (as selected by the switch on the front of the swivel assembly) directly to any low-impedance amplifier input. The low-impedance connection is recommended where long cable lengths are required or under conditions of severe hum disturbance. The permissible cable length is practically unlimited since neither response nor level is appreciably affected. Shure Model A95 Series Line Matching Transformers are available for use in those cases where a low-impedance microphone line is desirable but the associated amplifier has a high-impedance Input. These transformers provide a proper Impedance match between a 19- to 300-ohm microphone line and a high-impedance input and are available with various input and output connectors.
Figure 2—Directional Pattern
Figure 3—Overall Dimensions
Figure 4—Internal Connections
Text and graphics are from the Shure 330 Data Sheet 27A115 (UC)
Webmaster’s Note: The Shure Model 330 Data Sheet published in 1956 calls this microphone the Unitron, while the 1981 Data Sheet calls it the Uni-Ron. Here is what Mr. Rick Waller at Shure told me: “The 330 was always the 330. It may have changed names due to some marketing issue. Who knows, as items such as that are lost in history. But, if we would have made any changes, we would have changed the model number.”
Rick Waller
Applications Engineering
Shure Incorporated
8/27/2004 9:03 a.m.
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Dear Stan:
Regarding the Shure 330 Unitron/Uniron issue: Unitron has been manufacturing telescopes and optical devices since 1952 (http://www.unitronusa.com/). It’s likely that Shure changed the 330’s model name to avoid trademark infringement issues. Whether this was prompted by Unitron or not I can’t say.
All the best,
Steve Ward
Assistant Professor of Music Technology
Mercy College, White Plains Campus
4/4/2006 11:08 p.m.
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Photograph courtesy of Bryan Sell
Photograph courtesy of Dennis Schrank
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