I have the SLI-80F1 from Upscale and love the amp. One thing I did based on Cary's suggestion was to replace the 5U4's with 5AR4's in the rectifier position and it made a huge improvement in the transparency and bass of the unit. I bought a pair of Svetlana's from Upscale for $15.00 a piece acording to Cary no need to spend big dollars on the Mullards (Bang for the Buck). I drive a pair of Focal 1007 Be monitors in triode mode and it sounds great with plenty of power. Listen mostly to Classical both Chamber and Symphonic works along with some Female Jazz Vocals. Use primarily an analogue front end VPI Classic 1 with a Herron VTPH-2 Phono Stage. My cd player is a heavily modded Sony SCD-1.
Thanks Chuck