amplifier | The Tube | Amplifier | Cathode ray tube | X-ray tube | The Tube (TV series) | The Groove Tube | tube | Traveling-wave tube | Tottenham Court Road tube station | cathode ray tube | Youngstown Sheet & Tube Co. v. Sawyer | Westbourne Park tube station | Tube Tales | Torpedo tube | Shoot 'em up#Tube and rail shooters | Piccadilly Circus tube station | Peter and the Test Tube Babies | Audion | Aldwych tube station | Youngstown Sheet and Tube | Tube | South Kensington tube station | Mornington Crescent tube station | Instrument amplifier | Ibanez Tube Screamer | Hammersmith tube station | Golders Green tube station | Eustachian tube | Covent Garden tube station |
Synchronized film dialogue became possible in the late 1920s, with the perfection of the audion amplifier tube and the introduction of the Vitaphone system.