The Shure Unidyne B 515SA is a vintage dynamic microphone featuring Shure’s legendary Unidyne directional technology, a design that helped define modern microphone performance. Known for its focused midrange, strong presence, and excellent feedback rejection, the 515SA has been widely used for vocals, harmonica, guitar amps, PA systems, and speech.

Favoured by blues musicians and vintage enthusiasts, the Unidyne B capsule delivers a punchy, forward sound with natural compression, making it ideal for live vocals and amplified instruments. Its robust construction and simple internal design have allowed many examples to remain in reliable working condition decades after manufacture.

The 515SA variant includes an on/off slide switch, making it particularly useful for live performance and stage use. A true piece of microphone history, this model is an excellent choice for players and collectors looking for authentic vintage Shure tone.

Specifications

• Brand: Shure

• Model: Unidyne B 515SA

• Type: Dynamic microphone

• Polar Pattern: Cardioid (Unidyne)

• Era: Vintage (1960s–1970s era production)

• Frequency Response: Approx. 50Hz – 15kHz

• Impedance: Low impedance

• Switch: On/Off slide switch

• Power Requirement: None (dynamic mic)

• Connector: Jack

• Application: Vocals, harmonica, guitar amps, live sound, PA, speech