The difference between the Tube Box S and the built-in phono stage on my amp is astounding, and has to be heard to be believed

but, I replaced the 12ax-7 tube with a matched set of Telefunken tubes and picked a pair of Grounded Brass Tube Crowns from MapleShade audio (about $82 for the pair) and did make some positive difference and, in my opinion, worth the price