There have been questions about what sets will work with the 61610. Recently I moved a 61610. I plugged in a 7731. It worked fine, including the lighted dial. I already have 7730s working on a 61610. I did not have an extra 7736 (3 line display)available to test. The 624 works with everything (7030/7730/7731) except the 7735/36 needs the late revision to work. I couldn't find it in the manual but I seem to remember it takes a -4 or -5.
Mr. G, could you verify the revision?
Thanx, KLD

KLD, I checked me Tech. notes from Pana.
-4 and higher for the 7735/7736
As I recall there were some compatibility issues
with the 7300 Euro design sets but there long gone anyway.