9013 transistor magnification
9013 is a commonly used npn low-power transistor, and its magnification is generally 80~200. The magnification of the transistor 9013 is related to your circuit configuration, and their β will increase as the temperature rises.
The influence of temperature is related to the form of the circuit. The voltage divider type amplifier circuit and the addition of temperature compensation components can reduce the influence of temperature on the circuit.