The PSU on the MEK6800D2 is a bit of an unknown quantity and built on veroboard. The whole assembly really isn’t in keeping with the rest of the system. I did find out that new LM309K’s go for near on $100 though! (the old PSU has one) So I’m taking the opportunity to build a new power supply. Still using a TO-3 style metal-can regulator, and a TO-3 SCR to crowbar the PSU in case of an overvoltage condition (sooner blow a fuse than blow up the 6800 system)....

March 27, 2021 · 1 min · 154 words · TassieBob

Found this today

No idea if it works – haven’t even tried to power it up yet, and when I do, it’ll be from the current limited bench power supply as I have no idea if the power supply inside the box works or outputs the appropriate voltage. First mission is to track down the manuals and schematics and see if the empty IC sockets are going to be a problem, or if they’re just optional components for specific situations....

February 27, 2021 · 1 min · 88 words · TassieBob