 Today, descendants of the original valve (or vacuum tube) still play an important role in a range of applications.They can be found in the power stages of radio and television transmitters, in musical instrument amplifiers (particularly electric guitar and bass amplifiers), in some high-end audio amplifiers, as detectors of optical and short wavelength radiation, and in sensitive equipment that must be "radiation-hard".In 1941 the London Power Company commemorated Fleming by naming a new 1,555 GRT coastal collier SS "Ambrose Fleming".