While I too kept my SP-9, mki, I later acquired an SP-10 mki that was a workhouse in my system and paired well with Vandy 3A's and both an ARC VT100 mkiii amp and a pair of ARC M100 monoblocks. Mostly analog playback. A year later, I added an SP-11 mki that was pleasing with digital sources but less so (IMO) than the SP-10 for analog. But I did go back later and replace the stock ARC (Russian?) tube in the SP-9 with Siemen CCa's which really kicked up the 9's performance. Perhaps a little tube rolling might improve your existing situation?
What Preamp to replace ARC sp-9 mkIII
I am thinking of replacing my sp-9 mkIII that has been in my system since 97. Sonically I love it. However I do ocasionally have issues with light distortion at the gain and balance controls. Unit has been to ARC twice for service over the years. I know other ARC gear owners that have similar complaints. Something I have lived with because it sounds so good. I listen to vinyl exclusively. Phono stage must be tops. I also like the hybrid sound of the sp-9 and am a bit concerned going to full tube pre given my speakers- Vandersteen 2ce sig. Amp is an Aragon 8008st. Cables Harmonic Tech. Was considering BAT gear or an upgrade to another ARC piece...up to $3000 budget. Suggestions? Thanks...