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A BJT Transistor requires 0.6 ~ 0.7 volts from the base-emitter junction to turn ON.
The input is a sine wave so from 0 to 0.7 volts the transistor will be in the OFF state.
We can see this happening with the flat lines on the output ( blue curve ).
To resolve this issue, we can use diodes for biasing, so the transistors can always conduct ( red curve ).
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