------------ ORIGINAL MESSAGE ------------(may be snipped) On Tue, 25 Apr 2017 20:37:07 +0000, Manfred wrote: > >And why on earth should I use two power supplies in series, instead of >using a single one of the proper voltage? REPLY: Cost. 50 VDC 3 kW supplies are available on eBay dirt cheap. Obsolete telephone equipment. 73, Bill W6WRT