The Otari I have is a noble machine that - I feel the need to point this out to papabear and the late Reverend - WORKS
. It plays back records, fast forwards, rewinds - all the good stuff. In other words, it is not a paperweight with a Studer or Revox badge. The MX5050II (not the MX-5050) adds bias and record level calibration functionality, and it can play back 4 track tapes. It has a crappy reel-attachment method, but I can transplant the one in the mx-50 to a 5050II.