1- My first ESL tweeter, the three RTR's in the ESS TranStatic loudspeaker, also used by Arnie Nudell in his Infinity 2000A. The TranStatic employed the KEF B139 woofer in a quarter-wave transmissionline enclosure, the B139 also used by Dave Wilson in his WAMM.
2- My first (from 100Hz up) full-range ESL, the Infinity Servo-Static 1.
3- My first Decca cartridge, the Blue.
4- My first direct-to-disk LP, Lincoln Mayorga and Distinguished Colleagues Volume 2 on Sheffield Records.
5- The Magneplanar Tympani T-1, bi-amped with ARC electronics: SP-3 pre, ARC passive x/o, D51 and D75 amps. Source a Thorens TD-125 MK.2 table with a Decca Blue mounted on a prototype ARC arm that never made it into production. A life-changing experience!