Very cool gear !!!
Grateful Dead- Sotheby's Auction
Nearly 350 items including a bunch of their McIntosh amps up for auction-
https://www.sothebys.com/en/buy/auction/2021/from-the-vault-property-from-the-grateful-dead-and-frie...
https://www.sothebys.com/en/buy/auction/2021/from-the-vault-property-from-the-grateful-dead-and-frie...