Paul,
My sense is that you are better of buying a used 50v supply from the
telco equipment industry than you are trying to build one. I
especially like the Valere rectifiers, like this one:
http://www.ebay.com/itm/Eltek-Valere-H2000A1-2000W-Hot-Pluggable-AC-DC-Power-Supply-Rectifier-Module-/130844461639?pt=LH_DefaultDomain_0&hash=item1e76f00a47
$119 for a serious, professional grade, 48v x 40 amp power supply is
pretty hard to beat. These guys have excellent output power quality,
and for a bonus can be controlled via a digital interface if you feel
like it.
Good luck,
***dan, K6IF
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