here we have a old Sansui Twin tape deck as you can see the door cover off deck a is missing it does work and play on both decks but one is only playing on one channel when I tried it. ok it's old and prob needs servicing , the tape doors open a bit slow and I seem to remember having to double press a button or two to get it to do what I wanted and maybe a button or two got momentually stuck , but seems alright now I'm looking at it a second time. hopefully the issue with playing on one channel is a easy fix but sold as 'for parts or not working' on my part only tried once quickly so may of missed stuff will post , free to normal uk
eBay