Denon PMA-A110 Phono Upgrade!

Schiit Mani 2 for $160 is an easy recommendation. 

I always recommend return option when searching for a Phono Stage.

I just checked, your Denon gets great reviews, it's Phono is like my Luxman and many others, the optional MC input impedance is fixed at 100 ohms, it is best for an MC cartridge with a coil impedance between 8-12 ohms.

For other MC cartridges, you could use a Step-Up Transformer (SUT) and the Denon's MM Phono Input.

My experience: the 3 mid priced SS Phono Stages I found: great reviews, tried, and returned, were Schitt; iFi; Cambridge. 

I have found two very inexpensive SS Phono that were surprisingly preferable to those (and also preferred to my McIntosh C28 SS MM Phono): dinky built-in phono eq card in AT120 TT, and a $14. Pyle I bought just to get listening while trying the 3 abovein my revamped office system.

Main System: The Phono I found and prefer is MM Tubes in my McIntosh mx110z tube tuner/preamp, and I use a separate passive SUT with 4 impedance options for MC. 

Office System: The Phono I found and prefer is MM Tubes in my Luxman SQ-N150.

Are you using your MC At33xMLB on the lighter headshell? Or the MM VM95 that came mounted in it?

tube MM Phono unit in Canada

https://www.canuckaudiomart.com/details/650287540-handcrafted-david-yee-mm-tube-phono-preamp-audiophile-sound/