Hi Dela!
About 1 year ago I bought a Stellavox SP7C recorder in Italy, This is a modification of the stereo. But the block of heads is mono. It is good that the heads are not red, they are more modern - silvery. The condition is very good, from below all the boards were in place and it looked good and clean. The seller said that it does not turn on ... I agreed and bought a recorder for ridiculous money! As a result, I have a stereo recorder in good condition that won't turn on. I haven't figured it out yet. Perhaps I can give it to the master for testing according to the scheme. But without changing the board modules, it will not be possible to understand the malfunction. It has a steel drive belt. Is it better to replace a steel belt with a rubber drive belt?
I'm not sure if it will ever work, but its ridiculous price ... The SP8 model, even the mono version, is certainly better than the older SP7!