valve amplifier
type of electronic amplifier
Valve audio amplifier
type of electronic amplifier of sound
Ultra-linear
type of valve power amplifier stage employing pentodes or tetrodes
Wireless World Quality Amplifier
classic tube amplifier design by W. T. Cocking
single-ended triode
single-ended tube audio amplifier employing a triode in the output stage
Williamson amplifier
1947 reference design of a low-distortion push-pull tube amplifier