One tube radio receivers are not very good at producing a signal strong enough to to operate a loud speaker, so the 2 stage audio amplifier was created. The Aeriola Sr. Amplifier was offered in March of 1922 and sold for $68.00. It was later named the "Radiola AC" & the Receiver, the "Radiola Senior". When the Radiola name was adopted, the paper "lid labels" were replaced with metal plates.

Lid instructions and other items for the Aeriola line, click HERE.