@ateal You can have my PMC-3 in mint condition because my FR-7fz is much better cartridge than any of them.
According to Jonathan Carr who's a friend of Isamu Ikeda:
"From my perspective (that of an active cartridge designer), the closest thing to a non-integrated headshell version of the FR-7 was the PMC-3, but even this remained quite a way off. The FR-7 had a radically different coil former (cube-shaped), likewise for the magnetics (dual magnets, quad polepieces). IMO, the FR7s were by far the most interesting of FR's MC designs, but the 7's basic design concept dictated that they would always be big, heavy monsters, suited for relatively few modern arms... My favorite FR-7s are the f and fz. The very low coil inductance of the FR-7 implies that loading can be fairly flexible, so I wouldn't be so concerned with the low impedance. Also, none of the FR-7s are overachievers in detail, and the top end extension is a little curtailed. so the downsides of transformer stepups won't be overly apparent. However, in consideration of the low coil inductance, should you choose a stepup transformer, I would look for a toroidal-core type. FWIW, I've known Isamu Ikeda for many years, and not once has he suggested that the FR-7 was any kind of successor to the FR-1. Even today he appears to remain proud of what he accomplished with the 7 (also the Ikeda 9), but the FR-1 hardly ever comes up in our discussions. "
According to Jonathan Carr who's a friend of Isamu Ikeda:
"From my perspective (that of an active cartridge designer), the closest thing to a non-integrated headshell version of the FR-7 was the PMC-3, but even this remained quite a way off. The FR-7 had a radically different coil former (cube-shaped), likewise for the magnetics (dual magnets, quad polepieces). IMO, the FR7s were by far the most interesting of FR's MC designs, but the 7's basic design concept dictated that they would always be big, heavy monsters, suited for relatively few modern arms... My favorite FR-7s are the f and fz. The very low coil inductance of the FR-7 implies that loading can be fairly flexible, so I wouldn't be so concerned with the low impedance. Also, none of the FR-7s are overachievers in detail, and the top end extension is a little curtailed. so the downsides of transformer stepups won't be overly apparent. However, in consideration of the low coil inductance, should you choose a stepup transformer, I would look for a toroidal-core type. FWIW, I've known Isamu Ikeda for many years, and not once has he suggested that the FR-7 was any kind of successor to the FR-1. Even today he appears to remain proud of what he accomplished with the 7 (also the Ikeda 9), but the FR-1 hardly ever comes up in our discussions. "