Copper and Stainless together in condenser?

[pope]

Has anyone done this? Stainless outer tube (let’s say 2”), copper inner tubes and plates (4 x 1/2” copper pipe). Braze with 45% silver. I want to make a heat exchanger with 1.5” tc in/outs so welding the outer parts in stainless for cost/convenience and then brazing in the inner parts for conductivity would be a good way to go, I’m just hoping varying expansion rates wouldn’t cause this thing to tear itself apart.