To add to Thom's fine point,while on the Phonostage subject,if we are speaking of tubed stages,there is alot to be gained in trying some really good NOS tube types.This,too,can affect bright/dark voicing which is SO easy to blame on other components.
I have a pal who spent really big bucks on 3 big name phono tubes.After repeated listenings to his set-up,my audio pals kept stating that it seemed as though listening to this SOTA set-up was like going to the dentist,and getting the drill.GNAWING!!
It would have been SO easy to blame the cartridge,speaker/amp interface,or cable choices,as this owner has a hard time admitting anything he spends big dollars on is NOT great.Yet,one night we decided to do some tube swapping,as he has a nice inventory of good tubes.Well the megabuckers were the culprit,and were sold fast!On Audiogon,btw.Hope non of you bought them!Now we no longer feel the need to have our molars checked,when listening.
BTW--We have just experimented in this exact set-up(which has very "high -line" equip.,btw)with the Walker SST contact enhancer(which has gotten great press),and have found that it adds a brightness to this set-up.This could be specific to this system,yet if my friend was NOT willing to do EVERY connection(tube pins too),and then wipe everything off(total job,12 hours),we could have easily blamed some other component,like a cartridge mismatch,for example.This is simply a good example of how many parameters can affect performance,with it being SO difficult to determine the culprit,unless one is privy to a really good/experienced audio group.My friend SID calls this symptom,correctly,"BOON-DOCK-ITIS"!!Or the inability to diagnose a problem due to living in the boon-docks(not close to other "philes!).Like me!
Moral of story--Go back to mid-fi,or take up a nice hobby,like tropical fish,unless you want to drive yourself crazy!!BTW-I have a nice 55 gallon tank for sale!
Best regards!