Knob stable in connection and broadcast power amplifier with knob

The utility model relates to a steadily connected knob and a broadcast power amplifier with the knob, which comprise a shell with an opening on one side, the shell is cylindrical, a lining is arranged in the shell, the shell and the lining are connected in a clamping way through a locking structure, the locking structure comprises a locking groove arranged on the inner wall of the shell and a locking piece arranged on the lining, and the locking piece is arranged on the locking groove. The locking piece is provided with a locking block, and the locking block is clamped into the locking groove to enable the lining and the shell to be connected and fixed in a clamped mode. A knob column is arranged on the power amplifier, a knob stable in connection is arranged on the knob column, and a volume display area corresponding to the knob is arranged on the power amplifier. The lining and the shell are connected through the locking pieces, assembling is more convenient and efficient, only one locking piece is a movabl