On 3/10/23 17:42, Paul Koning via cctalk wrote: > CDC 6000 series is the one I know of. But they'd also use either 1 or 3 > phase regular 50/60 Hz power. For example, the console display uses 3 phase > 400 Hz for its power supplies (nice for low ripple) and 60 Hz 110 V for fans. > The CPU cabinet takes 400 Hz power to run its power supplies but 60 Hz power > for the compressors that cool the Freon that cools the logic.
I believe some of the tape drives used 208V 60Hz single-phase. I'm pretty sure the big disk drives (e.g. 808) had 3-phase spindle motors powered from the 240V feed. I'd have to check, however. 400Hz for the logic. I don't recall what the Bryant 4000 drives used, but I"m sure that bitsavers can tell you. --Chuck
