Thank-you Jim for your info and advice on  the transformer.  While
reading your reply I came up with an idea for keeping it cool -- put
the silly thing in a big tub of water!

With  a choke input filter, the transformer will be more
efficient, but the output voltage will be lower-- 0.9 * 55 = 50.
I have a 12.6 20A xfmr that can be put in series. This should bring the
output to 61 volts.

73
Joe