the 1950's
I think the 1950's decade brought us some of the best canisters ever made. Let's see, there was the Eureka canned ham vibrabeat, the vibrabeat tool was not that useful and sounded quite annoying, but the motor that was used in that vacuum has a great sound to it. Many other vacuums of the time used that motor as well, and for good reason. I think Airway made some great canisters at that time, and the Kenkart's had a very quiet nice sounding motor as well. And let's not forget the Sunbeam dual deluxe. That was the most powerful canister vacuum at that time, nothing else even came close. And then there's the Lewyts, nice vacuums besides their flaw of shocking people, that's why I call them the zappers. Tom, did the General Electric vacuum you mentioned in the first post use the really nice sounding Ametek motor?