[G0HZU_JMR]

It is a nice PSU project and I think you will be pleased with the performance it offers. I couldn't resist looking inside mine and I spotted that the wiring could be improved. It now shows about a 10mV dip in voltage (from 13.70V to 13.69V) when stepping the load current from 2.5A to 15A.

Sadly, the ringing is still there if I speed up the edges on the 15A pulse. This may be something to do with the circuit design. I don't have any experience with the 723 regulator but it may be possible to improve the transient response with some subtle circuit changes.

However, the result below is now looking very impressive. It might be possible to improve it still further but there probably isn't much point as I rarely use this old PSU anymore. Having done these performance tests this weekend I'm even more impressed with it. Back when I built it in the late 1980s I think I only had an old Tek 585 scope, a few load resistors and a basic DMM to test it with.