Charles, thanks for showing those test numbers, because the use of the term "clipping" there makes no sense at all. Actual clipping would be evidenced by distortion at least 100 times that 0.016% figure. The test numbers confirm the excellence of your 3300 and indicate that audibly clean output on the order of 140 watts was delivered.
Although the use of "clipping" in that commentary is, again, incomprehensible, I do know the context in which S&V uses the term. It is the point at which THD reaches 0.3%. This is still rather strange usage of the term(inaudibly low distortion would be a more accurate descriptive term at that point), but not nearly to the same extent. Actual clipping shown by flattening of the top of the waveform doesn't occur at any specific THD level, but certainly in all cases would be greatly in excess of 1.0%.
