Audio equipment, namely, pre-amplifiers, analog-to-digital converters, digital-to-analog converters, microphone pre-amplifiers, musical instrument amplifiers, audio amplifiers, bass amplifiers, electrical pickups for use with musical instruments, electronic sound pickup for guitars and basses; amplifiers; guitar amplifiers; electronic control circuits and circuit boards for use with audio equipment and amplifiers; electronic components for audio equipment, namely, amplifiers, for guitars and ...