Re: server based UPS
DEC-10 KI10 processor, even better. Absolutely massive transformer in each 38" rack (each processor was 2 of them plus a 3rd for console, DECTapes, paper tape reader/punch, hundreds of blinkenlights) full wave rectification, even bigger caps for smoothing. 8VDC or so fed to series stabilisers down to 5VDC for the TTL along each row. The series stabiliser power transistors were in their own airflow up the end of the row.
Aircon and humidifier failures totally swamped any power issues (if any, this was South Kensington :-) )
Biting the hand that feeds IT
