Looking for a replacement LM340K-24 fixed 24V 1A linear regulator for my bench power supply I've dicovered that TO-3 voltage regulators seem to be in the last stages of disappearing entirely.
Looking at all the whole category of TO-3 voltage regulators:
RS only have 4 models, and want around $100 to buy them individually:
Element 14 have 6 models and mostly similar pricing:
None are fixed 24v regulators. (Rockby do have some TO-3 regs cheap, but no +24V ones there either).
TI don't list any TO-3 package LM340s being made:
It looks like the only option might be NOS sellers on Ebay, and there aren't even any of those in Australia...
I guess everyone's using switch-mode regulators for higher power applications now, though I'm still surprised that such a previously common package for a range of still-common components has gone out of production.