This tape-recorder was produced in the year of 1981. The GX-636 is one of the very last entries in the, now famous, GX series. It is an extremely well made machine greatly benefiting from the evolving technology of its predecessors. Because of its 6 heads, 4 being Glass & Xtal Ferrite, it has the ability to reproduce tape with extreme clarity and stunning accuracy throughout entire frequency range. No other tape deck can compare to the GX-636 in terms of sonic performance, flexibility, and durability.