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The Shure 330 Unitron/Uni-Ron
unidirectional ribbon microphone

Shure 330

Shure Model 330 with Shure Model S33B Desk Stand.


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.

Shure 330 frequency response
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 selector

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.

Shure 330 directional pattern
Figure 2—Directional Pattern

Shure 330 dimensions
Figure 3—Overall Dimensions

Shure 330 internal connections
Figure 4—Internal Connections

Shure 330 technical specifications

Shure 330 vacuum tube input options

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.


Dear Stan:

Regarding the Shure 330 Unitron/Uniron issue: Unitron has been manufacturing telescopes and optical devices since 1952 ( 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.


Shure 333
Photograph courtesy of Bryan Sell

Shure 330
Photograph courtesy of Dennis Schrank

Shure 350 1956 data sheet
Download the 1956 Data Sheet for this mic.

Shure 350 1981 data sheet
Download the 1981 Data Sheet for this mic.

Shure S33 mic stand
Download the S33 Desk Stand Data Sheet.


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