Gene, as I just posted on another thread, the more desirable mint condition QUAD Open reels can go for $1K and UP. And the dolby~b encoded ones do require the use of an outboard Dolby b decoder. It's a lot more complicated than you think especially for a chap like me who would probably spend thousands on esoteric RCA cables to connect these decks/decoders to my pre~amp [4 Sets would be required] and if you DO have an older Open Reel deck [70/80 vintage] there are currently expensive tweaks that could also upgrade/restore them to 2017 level [newer internal electronics, wiring and heads]
To REALLY do it right, you can see where I'm going with the expenses incurred in achieving state of the art playback for maybe a few hundred OR tapes [if even that] and some of those reels have been released in DVD~A and/or SACD multichannel, which, IMO, on a state of the art digital front end would comfortably eclipse the Sound Quality of those Open Reels for a fraction of the cost.