TU60 Read/Write and Servo

This document is an engineering change order (ECO) and field change order (FCO) log for the TU60 Read/Write and Servo system. It contains a list of modifications, corrections, and rework instructions for various revisions of the hardware, spanning from October 1972 to August 1973. Issues addressed include circuit schematic mismatches, component replacements, timing adjustments, noise reduction, and tape handling improvements.