Consumer set that MAY have been used for security.
Usually security monitors have no tuner & are from other
mfg's like Panasonic, Sony, JVC etc. Pretty sure none
ever sold under Quasar label ( even though its a Panny).
These were great little sets, best in class IMHO.
Panny / Quasar took time to make them very servicable & of
a high build quality. Just a ball to work on, I could do it
all day.
73 Zeno
LFOD !