One of my regulars brought this in. He bought it for partly nostalgic reasons. It was in pretty good nick. All I did was PAT test, clean heads and change tape. The original send/return jack on this model is a 3 pole stereo TRS jack like an insert jack on a mixer channel. The extra, non standard jack next to it had been wired to the playback head mix. From here you got the echoes without the original. Presumably the owner wanted a tape delay for some reason. There was a bit of flutter from the direct drive induction motor but it kind of adds to the character of the effect. For a circuit that uses all 741 op-amps it had very little background hiss. Nice bit of vintage gear.