All you need is 2 25amp diodes and hook up so it looks like one half of
a4 diode full wave bridge rectifier, or it looks like a 2 diode full
wave bridge rectifier. The output is positive, and the input of each
diode is the positive output from each power supply.

in + |
\
+ out
/
in + |

pos from power1 to diode | output tied to second diode output
common output is positive at amp/power1 + amp/power2
pos from power2 to diode | output tied to first diode output

I would still supply each amp separately, due to voltage requirements.

Bob N9LVU

wrote:
I just had two powersupplies and ran the cables together so a simple
way of putting it would be that I have an amp, and i took the + from
both powersupplies, and put them to the + on the amp and the same with
the -. do you think it would work for me to get some bridge rectifiers
from radioshack? (25 amp bridge rectifier is $3.50 or something like
that,) get 2 of them and isolate each powersupply?