I am originally from the New York City area and can remember the high fidelity shows that were presented free to the public. They were usually staged at the New Yorker hotel in the 50's and 60's. They took up 4 floors. All kinds of equipment was demonstrated. A lot of it is now considered "high end". Manufacturers have come and gone, but a few have managed to hang in there. Macintosh, Ampex and Marantz come to mind although they are probably under new management. I think the only equipments came from Germany, Great Britain and the U.S. Japan's Sony was starting to show up with their bare tape deck that was building a good reputation for itself. If you are older than 70 and from New York, you might remember the Hi-fi shows.
Being a combination of sophisticated electronics and precision mechanisms, this would have appealed to engineers of the day.
My first Hi-fi amplifier was a 10W, Bogen, PH-10. It was more of a pa amp than a Hi-fi amp, but that's what got me started in the world of Hi-Fi. Back then, there wasn't all that much available off the shelf, so experimenters like myself had to make a lot of our equipment. It helped to own an osciliscope, audio generator, a VTVM and a tube tester, all of which I had. We had to design and build our speaker enclosures and learn jow to deal with the problems that plagued early hi-fi enthusists, like hum, resonances and vibration.