I have a hard time recalling all the stores I shopped at back in 70's, you guys all have more concise memory than I. Always thought you didn't live in 70's if you remember the 70's.
Only distinct memories I have is going to places like Highland Appliance and Tech Hifif, other audio emporiums existent in Ann Arbor MI at the time. Also recall visiting any number of these emporiums on Woodward Ave, suburbs of Detroit. Some of my earliest equipment Sony and Pioneer receivers, Acoustic Research AR3 speakers, BIC, Thorens tt's,