Several models of transistor used in household appliances

The first part represents the number of electrodes in the tube, diode with the number "3" indicating the transistor. The second part represents materials and polarity, represented by letters. The third part represents the category of pipes, denoted by 'yu mu'. The fourth part represents the serial number of the pipe, expressed in digits. The fifth part represents the specification number of the pipe, indicated by letters. The meanings represented by the second and third parts of the crystal polar tube model are shown in Table 1.

The letter meanings of the second and third parts of the transistor models shown in Table 1diode

For example:

The commonly used models of domestically produced transistors are shown in Table 2.diode

The commonly used models of domestically produced transistors shown in Table 2diode