Gary,
I have never seen a T-550, although I know someone who has one. As for the other 4-tracks, I think Ryo has one in his collection. Beyond that, I have no idea where the other two are. I agree that it seems like a vast improvement over the 400, but it would still have needed to have evolved a bit for mass production. One neat thing about it is that it all bolts together... Everything! Even the cabinet may be disassembled into a bunch of stamped metal panels. Plus, there is room in the cabinet for two small children or a good sized dog. Or maybe a cooler of some kind :-). It certainly is very road worthy.
Frank
In a message dated 10/29/2009 9:16:34 A.M. Eastern Daylight Time, gabru@comsec.net writes:
Frank,
Do you know anything about the history of this machine or any of the other 3 that were produced (who used them, recordings,etc. )? This machine has always intrigued me and seemed a better design than the 400 (fixed heads, etc.). Have you ever seen one of the T.550s (400 built into a road case)?
Gary