601 was a portable analog reel-to-reel
tape recorder produced by from the late 1950s through the 1960s. Ampex manufactured a singe-channel model (the 601) and dual-channel version (the 601-2). The suitcase-sized, 26lb unit was designed for the professional recording applications. It recorded to 1/4" tape on 7" reels.
- http://ftp.ampex.com/ampex/manuals/audio/601man/601schem.gif (schematic)
- http://ftp.ampex.com/ampex/manuals/audio/601man/601-man.pdf (owner's manual, PDF)