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The idea of using a step up transformer between a moving coil phono cartridge and an active phono preamplifier seems like an ideal solution for boosting the tiny voltage from the cartridge. A step up provides needed gain for the microvolts produced by a phono cartridge, and also provides the proper load for the cartridge’s impedance.
Several years ago, I borrowed an Air Tight ATH-1 moving coil step up transformer and it changed my life. Well, maybe it was not a life-altering experience, but in audio terms, the audition was significant. The Air Tight sounded exceptional, adding a noticeable amount of richness and depth of tone. It also seemed to provide a better load for the moving coil cartridge.
"Possibly the most valuable aspect of live, acoustic music for the evaluating the truthfulness of an audio system is the feeling one often gets of the music's purity, sweetness, dynamics, and transparency. "