Help with this transformer/ power supply

[Ionstorm]

I have a power transformer that has a 117vac primary
and a 110vac c.t. secondary.
The primary fuse is a 6amp.

Going through a bridge rectifier in conjunction
with two 6800uf/63v caps to give a DC supply
voltage of 50 volts+/- no load

with a 1.5amp load across the Supply + / -
I get 46.5volts+/- and with a 4 amp load
across the Supply + / - I get 37.5 volts+/-

This power supply came out of a Sunn P.A. twelve, which
I can't find any literature on. According to the
back panel it would put out 200 watts audio into a 4 ohm load.

I don't know what kind of amp circuit it had because it is gone.
All that was left was the faders and the power supply.

The transformer is a shielded typical squared power transformer
that you would see in the early seventies.

Does anyone have an idea of what size of mosfet amp I
could build that it would power?

this link should show a picture of the power supply:
http://home.sw.rr.com/edsmix/powersupply1.jpg

Thanks in advance for any suggestions.
Ed