AMPLIFIER

摘要

The object of the present invention is to repair or to replace an amplifier for a portable telephone or the like without loss of an amplifying function even when the amplifier malfunctions. A plurality of door-shaped amplifier parts (10) are provided on the left and right sides of an amplifier box. The left and right door-shaped amplifier parts (10) can be mounted on opposite sides each other. One amplifier part (10) is in service and the other amplifier part (10) is a backup. In the case where the amplifier part (10) in service malfunctions, the other amplifier part (10) is used as it is or is mounted for use on the opposite side.