THIS IS A Revox A77 MARK 4 2TRACK Reel to Reel Original Part. This part came from a tested & working Revox A77 2 TRACK Mark 4 unit (until the unit stopped working within it’s speed control functionality which couldn’t be fixed). Thusly, we are parting out this unit. The part is TESTED, working, and is in good cosmetic condition. We also have the following available from the same unit: · The COUNTER · Head Stack/Tape Guide Components · HEADSTACK DOOR · PCB CARD CIRCUIT BOARD · INPUT AMP PCB · KNOB SET · OSCILLATOR PCB · PWR SUPPLY CAPS · PWR TRANSFORMER SETUP · RECORDING RELAY PCB · REPRODUCE AMP PCBS (2) · SPEED CONTROL PCB (2) · STUDER MOTORS · Switch & Relay Board · VUs Any questions? Feel free to reach out to us. Happy Hunting!