Hi mfding,
Thanks for the answer. I agree with what you are saying about collector voltage cannot go below 0 (more like VCEsat) and that it will be clipped but nothing prevents instantaneous voltage to rise beyond 2*Vcc. The assumption you are making is waveform is pure sinusoid. In that case too lets say a sinusoid can go to 3*Vcc, wont't upper side of waveform be unclipped and lower side will be clipped to 0 or VCEsat? I think now I understand that its us who force it to 2*Vcc peak with proper termination so that ouput waveform is sinusoidal for linearity in class A. Do you guys agree?