group buy for homebrew CPUs?

On 8/12/2006 at 3:02 PM Don wrote: I've been out of that area too long. This was when I was a YOUNG man. That was the day of mechanical chopper-stabilized vacuum-tube amplifiers, some running from 25 Hz mains power. Heck, some places back then still had key-wound chart recorders wtih clamp galvanometers. (Somehow, the word got out that the galvanometer supports were gold, so we'd usually have to come by a couple times a week and replace them). For some burner control, I do recall some optical quartz-lensed thermopile heads, but they weren't common. You checked accuracy of thermocouples with a hot-wire optical pyrometer and calibrated instruments with a potentiometer bridge and a thermometer (to measure the cold-junction temperature). Weston standard cells were still in use. Cheers, Chuck