The Pioneer SX-3700 is a vintage stereo receiver that emerged during the transitional period between analog and digital technology in 1980. Featuring a Fluroscan display, the SX-3700 represents a blend of analog styling with innovative digital features. It offers a power output of 45 watts per channel and employs a direct coupled amplifier design for enhanced performance. The receiver includes a 3 gang FM tuning capacitor along with quartz servo lock technology, providing an impressive FM tuner section known for its clarity and stability. The Fluroscan display is notable for showing five digits, which is an advantage over many contemporaries that utilized four digits. Additionally, a variant of this model exists in the form of the SX-820, targeted at the European market with a distinct black dial face and white Fluroscan display. The SX-3700 is surrounded by a series of models, including the SX-3800 and SX-3900, although these have more complex designs. Users have praised the SX-3700 for its effective bass response and overall sound quality. Its relatively simple operation and solid performance make it a desirable option for enthusiasts of vintage audio equipment.