Check the listing for details. 50Y7/GT - 100% TESTED GOOD VACUUM TUBE- TESTS STRONG. Condition: Used. Listed at 11.50 USD. QUALITY TESTED GOOD ELECTRON VACUUM TUBES: This Vacuum Tube(s) "PASSED" QC test(s) per specification on the KNIGHT 600A’s test meter scale. Tubes are ergonomically packaged to protect them for mailing to your location using the USPO. *ZElectronTube Suppliers include: Magnavox, GE, CBS, Raytheon, Sylvania, Kenrad, Silvertone, Admiral, Hytron, others as inventory dictates. Note: *ZElectronTube has thousands of tubes in stock, so please e mail your requirements to me for a quick quote on tested/certifiedNOTE: THE PIC IS MY BUSINESS LOGO. I AM NOT SELLING A TUBE TESTER - Buyer Beware: No returns/refunds for those who think they are buying a tube tester. I reserve the right to provide buyers with EXACT REPLACEMENT (or) substitute vacuum tubes as inventory requires.