So I rebuilt my power supply on my Mata Hari with the usual new rectifiers, and all seemed well. Voltages were a tad high on all the checkpoints, but pretty close to spec. I notice later my displays flickering, and one blank. I check the connections and they appear good.

Deciding to start at square one, I put a multimeter on test point 2 on the power supply and BAM %#) 530 VOLTS! I checked the four in4004 diodes and the resistor that comprise this circuit on the power supply, and they all test good. How on God's green earth am I getting 530 volts? And nothing was touched from when it was within spec.

So I'm gonna throw in the towel and buy some 5volt LED displays that do away with this nasty high voltage (anybody want to buy some original displays), but I'd sure like to understand what happened here! Please educate me if you can - I hate not understanding whats happening.

OK, I am officially cut off for the day. I had my MM set on AC, which does show 530 volts, but when I switch to DC (as I should have to begin with) I see 230 volts.

I would erase this thread out of embarrassment, but perhaps it will be a cautionary tale to a future Pinsider.

I'm still buying the LED displays