マグネチック・スピーカーの音聞いたことありますか？

① A video showing the state of decay at the time of purchase and disassembly.    • 物資不足時代の並四ラジオを分解してみたら（第二次大戦前後の真空管ラジオ）   ② A video showing the restoration of a 4-speed radio chassis and the sound it produces.    • 真空管並四ラジオは復元できるか   What did the magnetic speaker in a 4-speed radio from before and after the Pacific War sound like? We uncover its secrets.