The Heco SMR 640 is a model of receiver produced by Heco, manufactured from 1975 to 1977. The new price at the time of its release was approximately 950 DM. This receiver belongs to a series that includes other models such as the Heco SMR 620, SMR 625, SMR 720, SMR 725, and SMR 740. The design elements typical for the era include a combination of analog dials, metal chassis for durability, and compatibility with various speaker and record player models from Heco. The SMR 640 is often appreciated for its solid build quality and functional performance within the home audio system.
