^^^ rantzmar ...
And this is something that is true of not just cartridges, but other electronics as well. My last two ARC amps, both the REF-75 and the REF-75se took over 500 hours to sound their best. And just like you said, it changes from listening session to listening session. One time you think its broken in a little bit and the next time its taken a backward step. Power cord and IC's do the same thing. Even the turntable belt that I ordered from originlive had a break-in period. In the belt's case I could actually hear it break in over about a one hour period. Slightly improved over the stock belt initially, but an hour later? ... Zowie!
And this is something that is true of not just cartridges, but other electronics as well. My last two ARC amps, both the REF-75 and the REF-75se took over 500 hours to sound their best. And just like you said, it changes from listening session to listening session. One time you think its broken in a little bit and the next time its taken a backward step. Power cord and IC's do the same thing. Even the turntable belt that I ordered from originlive had a break-in period. In the belt's case I could actually hear it break in over about a one hour period. Slightly improved over the stock belt initially, but an hour later? ... Zowie!