Both Onkyo and Yamaha made great tuners in the day. Mc was also considered pretty good, but they are expensive used. Onkyo T-9090 II or 4055 are probably pretty cheap used. Check on AudioMart and you might find one.
Yamaha had a T-2 that was also considered pretty good.
Obviously, the Sequerra was among the best, but even today they are REALLY expensive, and they break pretty easily. Not sure if you can get parts today for it.
Cheers!