I must have had a lemon! Bought it based on Harry Pearson's recommendation - said it reminded him of my ARC SP10. 1) It sounded nothing like my SP10. 2) It was 'bright'. 3)I couldn't get clarity from the manufacturer or distributer re proper tube selection or positioning - I'm talking about type, not brand. There was a conflict about where to place them - i.e., manual sez one thing, actual tube placement by mfg was the reverse. I opted to place them in positions where the mfg had placed them. 4)Thing was built like a tinker toy. RCA were soldered onto a printed board - obviously they came loose with ease. 6) Unit had (as I recall) 5 inputs but in reality only 3 worked - the other two were duplicative. I found it to be a POS which I couldn't in good faith sell - I deposited it into a trash can. You asked! :-(