Thank you for viewing my listing from among many products. This is a listing for four 6G-B6 vacuum tubes made by Toshiba (used/good condition/with original box). They are old, but the tubes themselves, the markings, and the pins are all in a clean condition. Please check the condition in the photos. Only the heater continuity has been confirmed, and specifications have not been checked. Also, recent operation in an actual device has not been confirmed. Please consider purchasing with the understanding that this is used and junk, and that no returns or refunds are accepted. (Compact) #VacuumTube #VacuumTubeAmp #Amp #VacuumTube6GB6 #6GB6 #ToshibaMade #HiFi #HighFidelity #FukuNoVacuumTube #GTtube #TokyoShibauraElectricCoLtd #Toshiba