It’s just a better sounding circuit. And it’s not just my opinion, it’s alot of peoples. I wish I could post the blind shoot out, but I have 7 clips of 7 different Tc Style clones: the DT, 33, grind, a few others, as well as 2 real TC preamps. This shootout was done in a professional studio done by some great people with great ears, all volume matched perfectly etc. they have shown this to over 50 pro bands, some of the biggest in metal. Not once ever has anyone picked a favorite that isn’t the DT clip, never once. The 33 is often in last place. Again, I know this is just hearsay, but take it for what it’s worth. It’s not for everyone apparently, and it doesn’t work with everything, but for amps with similar inputs such as the recto, it’s a ridiculously Great sounding tone.