nice nakamichi 680zx DUAL SPEED tape deck. works perfect--it is user calibratable. I have the user manual and service manual as pdf's for you too. My dad was using it but he just recently died...it never got much milage since I got my 10.5" open reel for long recordings....and he really didn't use it too much either. It was to record long radio shows which the half-speed feature makes very convenient. This unit is the BEST--allows 90 minutes PER SIDE of a regular 90 minute tape with better quality than most full speed decks. This also runs at full speed too. Full calibrations for both normal and half speed can be done easily and as often as you like to keep it in PERFECT tune--the adjustments are facing front at the meters by the other controls to keep it in tune--for constant tweaking for you absolute persnickity people. here's the brochure. email me if you want the full 22Meg .pdf of the attached as well as the .pdf of the user manual or service manual Definitly email me if you want to buy it! That's johnielvis AT aol DOT com. Thank you.