I want to know the answer to the following question:
What was an early took used to amplify sounds?
All the background I'm provided with is that "During the first half of the 1920s, engineers at Western Electric, as well as independent inventors such as Orlando Marsh, developed technology for capturing sound with a microphone, amplifying it with vacuum tubes, then using the amplified signal to drive an electromagnetic recording head.". Is that enough to answer the question?