Upscale Audio has some killer deals right now on the PL4 and PL5 tube stereo amps. I have always wanted a PrimaLuna amp but was real hesitant to drop the $2-4k on the current Premium line. Turns out you can get a PL4 or PL5 for under a grand right now, so I am hoping it will be everything I've heard it will be! I'm planning on using my Luxman CL-40 tube preamp on the front of this thing, and I'll be driving Klipsch Forte III speakers. When I called UA, the dude told me I'd be better off with the PL4 as the PL5 can sound a little harsh with horn loaded speakers like the Klipsch Heritage line. Aside from owning the CL-40 for about a month now, I know absolutely nothing about tubes. I am kind of hoping the stock tubes will get me the sound I'm looking for. Anyone driving one of these with a tube preamp that has any advice on optimizing the sound, and as a tube noob is there anything else I should know to enjoy this setup with minimal tweaking?