I aquired this 1977 Clone Theory from ebay a few years ago. It was a bit harder than I thought to find an original one that did not break the bank. This is the first version for around 1977 with the SAD1024 IC and its in pretty good shape for its age. I have read a lot on these and found that this effect was responsible for some of the great sounds of Peter Hook (Joy Division/New Order) and Robin Guthrie (Cocteau Twins)