VAX 780 on eBay

The discussion about 3-phase made me check some documentation. The drive I remembered that uses 3-phase power is the RP04. I remember a warning to the installer to verify the phase order; if that's wrong the drive will try to spin up in the wrong direction, which might partially unscrew the pack from the spindle -- that would be bad if the heads tried to load. The RP07 is also 3-phase. Other drives I looked at are 1 phase. I also looked at some CDC 6000 series docs. Those used 400 Hz 3 phase for supplying the CPU and peripheral logic. The CPU cabinets also take 3 phase mains power for the compressors (for the Freon cooling system). Curiously, the 1964-era 6603 disk drive uses only 400 Hz power. I wonder if that feeds the spindle motor, or if that was a DC motor? And the 626 tape drive wants 3-phase mains power. paul