Sanyo C1
The C1 was introduced at the tail end of 1982. It was the cheapest model within Sanyo's "C" series (C1/C2/C3/C5/C7/C9). According to the service manual, its output power is 2x2W. It's very basic in features, but it does have a Line In function. Here is one being carried by LL Cool J back in the day.