Ampex manufactured a single-channel model (the 601) and dual-channel version (the 601-2).
unit was designed for the professional recording applications.
Although there was no officially-released Ampex 600-2, there were factory bulletins available which detailed how to change the second electronics to support the equivalent of 600-2 mode, and this made use of the 601-2's head stack possible, thereby creating the functional equivalent of a 600-2.
The Ampex 600 and 601 were housed in light brown Samsonite cases.
The Ampex 602 was housed in a dark brown Samsonite case with similar rack-mounting provisions.