Oh, that's a good point :-) I was thinking that only Duo-Rs got the HOP-M3 and that the Turbo Duo's got the Sony laser.  I didn't think about it much... when i saw it, I knew that it was something good to grab before they scrapped it.  I also picked up a 1989 Technics rack mount CD player.  We'll see what kind of laser it has in it...since they're owned by Panny, I bet there's a Panasonic laser in there...we'll see.  The hope is that it has a HOP-M3...maybe I'll run out and grab it now and see :-)