Just got it in today, and gotta say " It is a looker". Looks aside, I took a peek at the board, and it has the JRC4558 and a couple of tantalum caps. It also has the buffer that most of the TS clones don't, that all original Tube Screamers have. I tried it out next to my '82 TS9 that also has the 4558 and it sounds and feels very much like the original. It's a good TS and at $139 seems like good deal.