WValve amplifier
WCrossed-field amplifier
WDanelectro Amp-in-case
WEpiphone Valve Junior
WFender Bassman
WFender Blues Junior
WFender Champ
WGjika Amplification
WMarshall JTM45
WMarshall Major
WMesa Boogie Mark Series
WMullard 5-10
WSingle-ended triode
WTube sound
WValve RF amplifier
WValve transmitters
WVox AC30