Wow, old thread, but still relevant to my interests. :P
I am now also wondering the difference(s) between these two radios. I own two K731s and just discovered the T2542 through eBay. Nick_the_'Nole states that the T2542 has an 'extra' switch for FM-AFC...however, the photos of the T2542 I have seen are exactly identical in every way to both of my K731s (which are themselves identical twins), including that switch, which appears to be the same across everything. Both of my K731s also have legs. I initially suspected that the T2542 lacks the troublesome electrostatic tweeter (which I still have yet to find a suitable replacement for!), but this is not the case.
Perhaps Zenith simply reclassified this radio after a time, during production?
