Hi, As an example, I have upload a datasheet of 2sc2328 audio purpose transistor. The datasheet clearly mentioned it as Audio Power Amplifier transistor. But in detail the transient frequency or current gain band product has "120MHz at 2V, 500mA". If the transistor is designed to drive audio the why they are playing around 120MHz? And when I ask any expert to use it around HF and VHF band, they directly reject! Why they do not test the different parameters of transistor around audio frequency? But testing the transistor to VHF range instead?