アンプ製造は化学電子物理学結晶体
<iframe width="1280" height="720" src="https://www.youtube.com/embed/QGmaeAUJWhg" title="SONIC PRECISION | Accuphase E-280 Amplifier Review" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<iframe width="1280" height="720" src="https://www.youtube.com/embed/2HgS6gvokEI" title="How It's Made - McIntosh Tube Amp" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>