What parts are there on the audio circuit board?

According to the function, there are resistors, capacitors, inductors, diodes, triodes (including power amplifier tubes), power amplifier tubes (or power amplifier integrated circuits) and so on. If we consider it more comprehensively, there are relays, photocells, displays and display driving circuits (including lcd display and led display, each of which has different circuit resistance and capacitance elements), microcomputer register memory and other original components (these are large-scale integrated circuits). However, it is not available on every audio device. The most basic is composed of resistance-capacitance elements and power amplification elements.