The Heathkit AJ-15 is a vintage FM stereo tuner that was known for its performance and build quality. It was part of Heathkit's extensive line of audio components designed for home use. The AJ-15 features a multiplex decoder for FM stereo reception, a rotary tuning mechanism, and a well-designed front panel with analog display. This model typically includes a signal strength meter, FM stereo indicator, and various output options. One of its standout aspects is the ability to adjust for optimal reception, making it a favorite among audio enthusiasts who appreciate tuners that can be finely tuned for different conditions. The unit is often praised for its solid construction and reliability, characteristic of Heathkit products from that era.