I have a MX5050 B3 and it plays TP tapes fine. All you need to do is change the switch on the back panel to play IEC OR CCIR Equalization and then play at 15 ips 2 track and you are good to go. I and some others on the Forum think the 5050 plays pretty well with the stock electronics. However, they are not as good , IMHO, as the Bottlehead Repro - which I have on my Bottlehead modded Technics 1500 series. But as an excellent start to the glories of the TP tapes, the 5050 works fine. Good Luck. Larry