Timeline of Shure Unidyne Model 55

Date Updated: September 14, 2017 FAQ #3505
Question:
Over the years, Shure has made many variations of the model 55. Please provide a time line.
Answer:


Timeline of the Shure Unidyne Microphone Model 55
March 1939
55A - $45; cardioid; low impedance (50 ohms)
55B - $45; cardioid; medium impedance (250 ohms)
55C - $45; cardioid; high impedance (15,000 ohms) 



1940
555A - $60; cardioid; low impedance (50 ohms); shock mount in lower portion of mic
555B - $60; cardioid; medium impedance (250 ohms); shock mount in lower portion of mic
555C - $60; cardioid; high impedance (15,000 ohms); shock mount in lower portion of mic



1942
55AV - $46; cardioid, low impedance (50 ohms); increased high frequency response for voice clarity in paging and two-way radio systems
55BV - $48; cardioid, medium impedance (250 ohms); increased high frequency response for voice clarity in paging and two-way radio systems
55CV - $48; cardioid, high impedance (15,000 ohms); increased high frequency response for voice clarity in paging and two-way radio systems
556A - $75; supercardioid; low impedance (50 ohms); shock mount in lower portion of mic
556B - $75; supercardioid; medium impedance (250 ohms); shock mount in lower portion of mic
556C - $75; supercardioid; high impedance (15,000 ohms); shock mount in lower portion of mic



1947
55 - $55; cardioid; add three-position impedance switch (low-medium-high)
556 - $85; supercardioid; add three-position impedance switch (low-medium-high)



1951
55S - $72; cardioid; add impedance selection switch (low-medium-high); "S" designation meant "Small"
556S - $100; supercardioid; add Cannon XL connector; add impedance selection switch (low-medium-high); shock mount in lower portion of the mic; "S" designation meant "Small"



1956
Shure factory moves from Chicago to Evanston



1961
55SW - $85; cardioid; add on/off switch; "W" designation meant "sWitch"



1967
55S Gold - $93; cardioid; gold plated 55S
55SW Gold - $95; cardioid; gold plated 55SW



1970
PE55 - $75; cardioid; factory set to high impedance; eliminate impedance switch; add plastic carrying case and cable



1978
PE55SH - $112; replace Amphenol connector with XLR connector
55SH - $100; cardioid; replace Amphenol connector with XLR connector; eliminate impedance switch; internal high/low impedance choice on XLR connector



1989
55SH Series II - $189; cardioid; low impedance only; new mic element



2009
Super 55 - $311; chrome case with blue foam; supercardioid; improved frequency response; low impedance only; no switch



2010
Super 55-BCR - $354; black case with red foam; limited production run; supercardioid;& improved frequency response; low impedance only; no switch



2014
5575LE - $499; limited edition reissue of the original model 55; cardioid; special packaging; metal carrying case; reissued S36B Art Deco mic stand; XLR-XLR cable with one right angle connector; no switch



2017
Super 55-BLK - $374; black case with black foam; supercardioid; improved frequency response; low impedance only; no switch



Link to PDF booklet about the Unidyne: The Unidyne Story



User Guides may be found at: http://www.shure.com/americas/support/user-guides/discontinued-products


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