HifiEngine has the diagrams for both. They have a different number listed, but it doesn't look like a true part number, unless they list parts by each model individually. One is listed as S003, to other S001. They both appear to be a double pole. The 2270 has the second half switching the outlet. The 2238 has the other half switching a B+ voltage for some reason. If it fits physically, and has a high enough amperage rating, it might work. Links to them. [http://www.hifiengine.com/manuals/marantz/2238.shtml][http://www.hifiengine.com/manuals/marantz/2270.shtml]
Power switch substitution for Marantz 2270
I have an opportunity to pick up a nice Marantz 2270 receiver for reasonable price. Problem is it has a broken power switch which I am told it a four pole switch. I currently have a Marantz 2238 receiver with an operational power switch with round switch button cover. Any chance this would work on the 2270?