Amplifier tuners; amplifiers; amplifiers being audio apparatus; amplifiers for transducers; amplifiers for use in cars for entertainment purposes; amplifiers for use with gramophones; audio amplifiers; control amplifiers; digital amplifiers; distribution amplifiers; dual amplifier balancers; electric amplifiers (current); electric amplifiers (signal); electric amplifiers (sound); electric cords for musical amplifiers; electric leads for amplifiers; electrical amplifiers; electrical amplifiers for driving servo motors; electrical amplifiers for sound signals; electrical amplifiers for use with musical instruments; electroacoustic amplifiers; electrodes with amplifiers; electrodes without amplifiers; electronic amplifiers; electronic switching amplifiers; guitar amplifiers; headphone amplifiers; image amplifiers; integrated audio amplifiers; keyboard amplifiers; power amplifiers for creating effects; power amplifiers for use in sound reproduction; power output amplifiers; power supply units for aerial amplifiers; signal amplifiers; sound amplifiers; stereo amplifiers; stereophonic amplifiers; transportable guitar amplifiers