The RS-5742 is the top of the line model in 1975 for the RS-5700 series of receivers.
Sylvania Phase Q-4, 4-Channel Matrix Output
Phono 1 accepts Ceramic cartridges via a rear mounted switch
Supports two sets of two speakers with an optional third set of two speakers for Phase Q-4 output
Stereo Tape Monitor
Magnetic Phono Input