Regards, Gentlemen: Ct0517 (Chris) referenced me to this thread, I've read it with interest. Not having an air-bearing tonearm, I feel somewhat like an interloper, but as I'm familiar with the Acutex carts, and although the 420STR is no longer available from this vendor:
http://www.ebay.com/sch/ebusinesspoint/m.html?_uhb=1&hash=item3a770b6404&item=251105338372&pt=Piatti_e_Lettori_CD&rt=nc&_trksid=p4340.l2562The 412s response is similar to the 420 but with more apparency in the mids. The 312 is less aggressive in the hfs, either offers the distortion-free character of the 420. The 310 (bonded elliptical) is not in any way remarkable, it's my impression of the 415 that some may find it overly analytical.
No association with the above vendor, he (?) has been reliable in the several transactions with me.
Peace,