I had the Nakamichi PA-7 (which shows how impulsive I was in my youth!) and it certainly was an amplifier, Class A, and very good about converting electricity into music and heat. Lots and lots of heat.Nakamichi didn't make amplifiers and they didn't make speakers but here we are.
Eventually it succumbed to the heat. I also had the matching Pre-Amp and Tuner. Those went in a garage sale to some lucky buyer over a dozen years ago.
I still have my Nakamichi TD-700 car stereo cassette player; I’m sure any rubber is long gone since I pulled it out of my 1982 Audi Coupé when I sold it in 1988.