I first saw a guy in Columbus, MO doing a single with a huge Lowry organ in 1975. I went home and bought a similar one a Symphonic something or other. It must have weighed a ton. I later got a Contempo 80 Lowrey and I remember thinking it was the last thing I'd ever have to buy because it sounded so good.
Then I switch to Yamaha organs in about 1980. I had a full size Chevy Van and could barely get all my stuff in it, including Leslies, Amps, speakers, etc.
The first arranger I saw was a Yamaha PSR 50 or 60. I got one, and a DX7, and a drum machine and a piano module and midied them all together. This cut about 500 pounds from my rig.
Then came PSR 70, 6100, 6300, 510, 620, 640, 740, 8000, 9000, 2000, 2100, Tyros, T2, S900, sprinkled in with Technics KN800, 1000, 2000, 3000 and 5000. Later came Rowland G800, Solton X1, Ketron SD1, SD5, Midjay, Roland G70, E50, E80 and Audya.
Someone stop me before I get out of control.
DonM