Had a Nakamichi 700 cassette player/recorder in the 70's, next to the hand built Nakamichi 1000 the best cassette deck you could buy (paid $850). Got it to copy vinyl from the college radio station I volunteered at, but after the station manager played them once and they got into the broadcast studio with their record grinders the records were worthless. Found out that even adjusting the Dolby B, head alignments, etc. even the best tapes sounded like crap on any other 700/1000.