What are the real world application for such a rack btw?
Apart from fully analog low frequency devices (OpAmps, multipliers...) and perhaps transistor dies, I see little usage for a rack full of K2636.
So perhaps a few of them at Analog Devices, TI... for their analog stuff, but for anything mixed signal or digital, those racks seem rather useless to me.
Except maybe, to power up digital circuits and see, whether there is a short or any other abnormal behavior?