Optonica SM1616 Restoration P1 of ?

This is a video of me restoring a vintage optonica amp, the amp was made in the lade 70's and was the low end of the optonica amps of that time, i started with this one due to it beeing not as rare as the larger ones i have. The noise heared in some of the clips is from my ZD915 desoldering station. I not think it would be quite as audible as it was, but whatever. Here is Part 2: https://www.youtube.com/watch?v=sq8CDJpqTbM