Tube or solid state phono stage?

As a very general observation:  if your tube system is in danger of lacking good dynamics, something is wrong.  At moderate to low volume levels, I expect tube gear to sound considerably more dynamic and alive than solid state.  As a more specific observation, your particular tube electronics is on the leaner side, not the warmer side, of tube electronics; for my taste, I would want a quite warm sounding phono stage in that setup.

I have heard, and liked phono stages from Lector (Italian, tube) and Audio Note (requires SUT for MC, very expensive), Allnic and Zanden.  I own the Italian Viva Fono myself.

You won't go wrong adding another AR piece to your system.  That would be the first place I'd look in your position.  

@big_greg,

I've never thought about adding AR to my system protection!

Audio Research Reference phono stage. If in your budget a 6SE or used 6. Exceptional phonostage and synergistic with the rest of your system. This is what I have and would not change it out. I have had Audio Reseach phonostages for over thirty years. At each juncture reasearch and listening has immediately led me back to stay with Audio Research. Also, I discovered the synergy of Sonus Faber, Audio Research and Transparent completely independent of the adage. 

I’m worried a tube phono stage may make the vinyl too warm sounding and not dynamic enough.

@stewartgr Dynamics only comes from the signal. If it seems to come from the electronics, its because of distortion.

Its much harder to build solid state phono sections that don't have problems with RFI. The reason this is important is LOMC cartridges generate RFI while playing. If the phono section can't handle it (and it can be as much as 30dB higher level than the signal itself) then it likely won't sound right. This has resulted in the use of 'cartridge loading resistors' which are really for the benefit of the phono section because they kill the RFI.

So if the manufacturer has a front panel 'loading' switch there's a pretty good chance they don't understand how this works. Actually its electronics 101 in the first week of college; when you put an inductance (the cartridge) in parallel with a capacitance (the tonearm cable) then you get an electrical resonance. In the case of LOMC cartridges this can be up to 5MHz. You can also search to see if people are using loading resistors with cartridges while using the phono section you have in mind.

A nice side benefit of the phono preamp being insensitive to RFI is its very likely you'll get less ticks and pops. That RFI I mentioned can overload the input of the phono section and when that happens it can generate ticks and pops.