・ Operation not confirmed ・ No model number printed on the tube ・ Based on internal structure, number of pins (9 pins), etc., 　 offered as a 12AU7 / ECC82 ・ "57" stamped on internal parts ・ Getter is silver ・ No clouding ・ No glass breakage ・ No bent pins observed ・ Unknown usage and storage history ・ No checks performed with measuring instruments No guarantee of performance or lifespan Complete match between box and contents not confirmed Sold as is No claims or returns accepted Please do not purchase if you are concerned Please purchase only if you understand that this is a used part and agree with the description, and if you have a good understanding of vacuum tubes #HALTRON #VacuumTube #HallElectric