I was wondering if someone can fill me in on the differences between the SM7, SM7A, and the SM7B. What was improved and what has changed between the models?
SM7 - Introduced 1973 with a U.S. retail price of $256.80.
SM7A - Humbucking coil improved; design of the mic mounting yoke also improved. Introduced 1999.
SM7B - Larger foam windscreen added. Introduced 2001.
The mic element is based on the Unidyne III design and has not changed.