Fixing a benchtop power supply I built 37 years ago

This one is still my favourite benchtop power supply, but I broke it recently, so it needed some repairs. This was also a good opportunity to try out my new Gochifix 3 in 1 scope meter. Review on that meter coming soon Amazon link for scope meter, and discount code: https://amzn.to/3VN7klZ Discount code (25%off): 25MathRS