It would be nice to run a solid line from the cartridge to the SUT. I do this, but I do use connectors at the SUT; not because I think it's electrically "optimal" but because I don't want to crack the case on the unobtanium T3000, let alone glop solder in there. If you do try for a total hard wire, remember to (somehow...)shield the inputs and outputs. No wire, connector, or solder choice will trump parasitic noise from the SUT. As for shielding, good luck with that, too. I hate to say it, but un-shielded cable consistently "sounds better" than shielded --- apart from the noise, of course. Somehow, I (seem to) get away with unshielded tonearm wire running from the cartridge to the SUT, which sits very near to the TT. Of course the arm and TT motor are well grounded to a dedicated Cu rod, and other electrics are well away from the SUT.