I never knew they made one that big. I still have my SX-780 that I bought around 1978 - primo condition and in the original box. I’ve got several stereos that I bought over the years and tried not to part with anyone them except an old 8-track I got in 1972 (still have the speakers though, I think).
I still have my 8-track component too. I bought my receiver in 1979 (Feb IIRC).