What happened to the smoke from the tertiary tube after the car subwoofer was on the phone?

Triode smoke represents: burnt by overvoltage breakdown and burnt by overcurrent smoke.

The smoke of the triode indicates that the current flowing through the triode is large during the working process, and the heat generated by the triode also causes the surface temperature to rise. The smoke of the triode indicates that the current flowing through the triode has exceeded its rated current, and the triode will burn out in a short time because of the excessive current flowing through the collector.