The HP 8600A Problem has Returned

[Penthode]

I am an electronics engineer and have designed regulated power supplies using the 723 since the '70s. I wanted to see voltage readings around the 723. The 723 is an old and reliable device.

I think this will be a simple problem to resolve. Why do you not first measure the voltage directly across the 0.56 ohm resistor as this will indicate the current from the +5v supply and immediately identify if the 723 is going into current limit mode.