Nice. Thanks for explaining it to me. I love learning about stuff like this. Looking back I think early military equipment may have used these as well. To your credit you kept it authentic and that's worth points to me. I fondly recall making PCBs with Sharpies (or whatever they were called in the 17th Century when I was young). After that there were the fiberglass breadboards—not the modern prototype ones, but the light brown ones with just holes and no solder points.
And just to go full nostalgic on you, there were those strips (see pic) in the 1970s that were ridiculously hard to build an entire project with, although some people found a way. Inevitably you ended up with spaghetti for wiring—no matter how hard you tried. But the worst tend, IMO, was the era of wire wrap. I went down that path briefly before losing my mind trying to trace tiny 30 AWG wires before giving up and screaming like a madman. Like Disco, the trend thankfully disappeared.
These days I enjoy bending steel mounting plates/racks for all my projects, and either using conformal coating or—more recently— Plasti Dip to protect them from shorts. I really should get into plastic bending, but I like the fact that I can use round and square punches to make pretty nice layouts on sheet metal for mounting PCBs and other components in the case (which is also fun metalworking).
Cheers. I really love your amp.
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