Combine 3 PA's together

What is your power rating? If not so high, you can use Mini-Ciruits power combiner.

each amp about 180w
so minicircuits is not option...

i can built wilkinson with 3 but i never saw that anybody did it i mean amp with 3

Yes the RCA Tri-phase AM transmitters, 3 X 50Kw =!
Frank

This thread reminded me of a article I recently read. They were using the refleceted power on a balanced amplifier to drive an auxiliary amplifier to improve efficiency, output pwr, gain and p1db instead of terminating it to a resistor on the coupler port. If anyone is interested Private message me and I can send you the article.

you can find different power combiners more than 500w in meca, rf lamba.com