Got this amp pre-amp combo, Technics ST-K806 pre-amp and SE-A808 AMP. looking into them the pre-amp is hard to find info or even listed for sale. I do see the amp, however, mine has no power button and most others do that I'm seeing online. Does anyone have info on these at all, have or ever had them, mainly the k806? great sound, really cool pieces i think, thanks