I can add some general advice and experiences with a couple of the brands and products recently mentioned where we're carrying CH Precision, Boulder, Allnic, Phasemation, Ypsilon and more.
CH Precision P1. This is one of the most advanced and versatile phono preamps that I know. A true "Swiss army knife" that can handle anything with access to all settings on the fly with inputs for up to three tonearms. The P1 is dead quiet, uncolored and unrestricted. It's a setup and forget unit with full flexibility which draws very little if any attention to itself.
Allnic. These are amongst the very best tube based phono pre amps out there offering a generous range of options - from the more affordable all the way up into the stratosphere. Allnic offers a very mature and refined tube sound - open, resolved, generous and dynamic.
Phasemation. I'm happy to see that this manufacturer is getting more and more attention being one of the most experienced within the analogue field in general. These are very genuine and understated designs where simplicity and purity is key rather than extensive features.
Ypsilon VPS-100. One of most well built, timeless and well balanced phono preamps out there still.
I'm also intrigued by the new Conrad Johnson ART phono which I still haven't had the pleasure of experiencing.
/ Marcus,
www.perfect-sense.se