I have two McIntosh MC2500 amplifiers that I kept from the old days, circa early eighties, late seventies (I had racks of these things back then - not sure just how old mine are. At over one hundred twenty pounds each, one rack of four was well over six hundred pounds, but it was all about rock and roll in those days) and I use one as a "touchstone" for most other gear, because I consider it almost flawless.
I mostly use my three SE84s to listen to my best open box gear, but sometimes I power them up with the McIntosh. It is a bit of a power touchstone, as I said.
I still use the open Visatron driver, but with two fifteen inch JBLs below. I have made a decent looking baffle, about five years ago; all sold maple from local "source."
(I stopped a guy down the street from splitting firewood and offered him bucks for his larger timber pieces. I have solid old growth maple to brag about, now)
The other I use as a part of my "home theater" style subwoofer system (which is used just for watching movies) which consists of four bi-amped fifteen inch JBLs and two ten inch running a small thousand watt Crown from the nineties. The McIntosh powering the four fifteens just sees the frequencies below thirty hertz, while the tens only see the frequencies above thirty hertz and up to about sixty hertz. You never hear my sub system. You only FEEL it when it is time.
I am the only one I know with a bi-amped subwoofer system and I live around a bunch of HT "experts" so to speak.
Only other piece of older gear I own sits abandoned in the garage, only powered up for wienie roasts and late night bonfires, is a Pioneer receiver from the seventies, sorry - I will have to go find out the model number - I salvaged from my company's (I work for a large company) first efforts at "recycling." Not really sure that it sounds as cool as it "soiunds" like it might, but I only use it as a simple (one hundred twenty watts, advertised) CD system. Bottoms are single fifteen, mid-highs are single twelve and single horn, all JBLs from the seventies, passively crossed.
Sounds fine for a backyard system.
Now they frown upon taking things out of the recycle bin, so I never will again. The company wants to responsibly dispose of this old gear turned in by customers, so no more shopping in the recycle bins.
That rule is hard to follow, sometimes. I had to pass up a few pieces of ancient Harmon and Marantz gear not long ago.