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The Shure Model SM33
cardioid ribbon microphone

Shure Model SM33


The Model SM33 is a compact and rugged uni-directional ribbon microphone combining wide-range response and a super-cardioid directional 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.

Microphone Features

  • Unusually effective super-cardioid 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.

  • Low frequency response characteristic adjustable by means of a Response Selector Switch.

  • Built-in shock mount for quiet operation.

  • Rugged mechanical design and internal ribbon protection assure reliable operation under severe conditions of use.

Shure Model SM33
Microphone courtesy of Jeff Rudisill


  • Type: Ribbon.

  • Frequency response: 40 to 15,000 Hz. Low Frequency Response Selector. See Figure 2.

  • Polar Pattern: Super-cardioid (Unidirectional) Response. See Figure 3.

  • Impedance: Dual. Microphone rating impedance is 38 ohms (50 ohms actual) or 150 ohms (280 ohms actual) for connection to microphone inputs rated at 19 to 75 ohms or 75 to 300 ohms. Wired for 150 ohms as supplied.

  • Case: Die cast zinc.

  • Finish: Textured light and dark gray enamel.

  • Swivel: Self adjusting lifetime swivel permits tilting the head 45° forward and 70° backward.

  • Shock Mount: Special live rubber vibration-isolation unit.

  • Stand Thread: 5/8"-27 thread.

  • Net Weight: 1 pound, 10 ounces (736 grams).

  • Introduced: 1965

  • Discontinued: 1982

SM33 frequency response

SM33 polar pattern

Shure Model SM33

Shure Model SM33


Johnny Carson's SM33

Johnny Carson's SM33
Images courtesy of Heritage Galleries, presented here with permission.

1977 SM33 advertisement
From the 1977 Shure Professional Products booklet.

1965 Shure SM33 data sheet
Download the 1965 Data Sheet for this mic.

1979 Shure SM33 data sheet
Download the 1979 Data Sheet for this mic.


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