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I'm happy with my ortofon styluses, I did look at Ecler rotary mixers funnily, I had a slimline Ecler back in the day and really liked it.
I have no idea how to check if the caps or crossovers are still good, I've been dragging them around and rinsing them since I swiped them from my dad in the 90's, so they're probably fucked. I wonder if there's some kind of audio workout you can give them to fault find. I'm so busy though, I'll try a new mixer and amp and hope for the best probably.
I would start with upgrading the Styluses as a starting point before you go further down the signal path. Ecler makes some nice rotary mixers if you can get over not having a crossfader.
Also worth checking if the crossovers are still good in the speakers. Some caps went on my old but newer than yours B&W DM620i's.