What's A Good Upgrade From A Manley Steelhead?

@rooze I am responding because I have the same Audio Tekne MC-6310. It was sent to Imai-san in 2021 for cantilever repair and returned much improved. It is paired with the Audio Tekne MCT-4818 SUT going to a Sun Valley tube  phono. My phono is not of Steelhead caliber admittedly and your OP is about phono preamp. But I have two other cartridges, a ZYX Ultimate Omega and recently acquired Transfiguration Proteus. Both cartridges go through the AT SUT into a lower level phono stage than yours. And with the Proteus, I feel that the vinyl front end will stay put for a while. 

Perhaps adding a higher caliber cartridge might be a the other way to go? My apologies for veering off topic.

@fsonicsmith1 I agree it’s an excellent phonostage and I’m sure it isn’t the constraining factor in my analog setup… just interested in trying something different. 
@ledoux1238 yes, a different cartridge is on the list. I wanted to upgrade the arm first, which I did last week, then find a good cartridge that works well with the new arm (Graham Phantom). I regret selling the Audio Tekne. I also sent mine back to the factory for a rebuild and it sounded great.

@rooze There have been times when I thought the Steelhead might be holding me back from pure listening bliss. The culprit proved to be one mediocre pressing after another. Perhaps a present-day state of the art phono stage would have made them sound more appealing. In fact, I don't doubt it. 

I don’t know how you would step UP from the Steelhead? It’s 10 grand. It’s as good as it gets. It’s pretty much the Bugatti Chiron of phono stages. You can go sideways or down. Looking at your system, you would benefit more from different speakers....

And the Bugatti you mention isn't a real Bugatti. But, I digress....