Richopp, did you sell the ARK Label LP's Bob Fulton recorded? Fantastic sound quality, as good as direct-to-disk! Fantastic transparency and inner detail (you can hear every single voice in the Minnesota church choirs he recorded), natural organic timbre, and deep, deep bass (the "shuddery" notes made by the pipes of the lowest organ bass pedals move my walls!). I have about a half dozen.
I never blew a single RTR tweeter, but I powered the Fulton J's with an ARC D-75. I have some spares of that great RTR tweeter, got them with the ESS Transtatic I loudspeakers (which had three in each) I bought used in '82. One speaker had a replacement woofer, not the correct KEF B139 (also used by Wilson in his WAMM). I called ESS, and got the last one they had in stock! I still have the speakers.
I'm really looking forward to hearing the new dual-dipole Magnepan "project" loudspeaker. Hope the tour comes to town.