Many, but most remarkable was ACR-25. 24-cassette 2" random spot player, 200msec lock time <10sec cycle time, most remarkable for the mid 70s.

War stories, or theory-of-operation questions, welcome. I knew this machine inside out, never admired one more.

Rotating carousel was fast/powerful, hazardous when servicing ?
Competition: room-sized, 'fuel-efficient' RCA cartridge machine
Google should use these for YouTube video storage.

And you could sure hear the vacuum capstans on this one. Love the satisfying clunks as it goes into play.

"Where are the missing carts ? "

"Oh some are bin loadin' "