Upgrade phono stage?


Have an AudioNote M1 phono MM.  It still delivers great music!  I don't know if I should upgrade the phono stage part.  Purchase a stand alone phono stage and run it through the aux inputs?  

Gear, George Wright mono blocks 2a3 (set)
          Audio Note M1 phono MM
          Jager Speakers (Bottlehead)
          Rega P3
robertod2a3
Thanks for your ideas.  I have tried rolling tubes, not so good luck.   NOS so expensive I tried new stock, big mistake. I will look at School Mani see where I stand. Definitely need to upgrade TT looking at Rega P6. Thanks again.
Your system sounds really nice.  Best upgrade path I would suggest is to switch to an MC cart.  Add SUT (like Bob's Devices) or active head-amp (like a Piccolo2).  Also try some tube dampers (even simple o-rings can make a difference).  
Thanks, I have thought about MC..but didn't want to change my system.  Your suggestions are an addition to my system sounds good, thanks again.