This very strong testing matched pair GE 5U4GB rectifier tubes was tested in our TV-7/U and they measured: Tube One: 62 / 59 (GE and logo stenciled on base with code 63-22 188-5; 5U4GB stenciled on glass) Tube Two: 62 / 58 (GE and logo stenciled on base with code 62-26 188-5; 5U4GB stenciled on glass) Minimum is 40; 100% is above 60. These tubes test: 103% / 98% 103% / 97%. Pair have gray plates, side D getters and nice side flashing. Tubes ships via United States Postal Service (USPS) Ground Advantage with tracking for domestic U.S. sale; Priority Mail is an option if you wish your package delivered quicker. International orders ship via International Shipping service. Package weighs twelve ounces (12 oz.). Check out other tubes in my store for your equipment needs. Combined shipping always welcomed. TUBES ARE GUARANTEED GOOD AND IN WORKING ORDER AT SHIPMENT. TRANSIT VIA POST CAN DAMAGE TUBES. THIS IS NO FAULT OF OURS BUT THE THIRD PARTY ENTITY THAT IS DELIVERING ITEM(S) TO YOU, I.E, USPS, UPS, FEDEX, YOUR NATIONAL CARRIER IF INTERNATIONAL, ETC. PLEASE INSURE THEM! WE CANNOT GUARANTEE FAILURES ON YOUR EQUIPMENT AFTER POWER UP AS THERE IS NO WAY TO ASCERTAIN HOW TUBES WILL INTERACT WITH YOUR ELECTRONICS; NOR IS THERE A WAY TO DETERMINE WHETHER THEY MAY HAVE FATAL FLAWS IN TUBES THEMSELVES! THESE ARE USED VACUUM TUBES AND TIME MAY HAVE TAKEN A TOLL ON THEM OVER THE MANY YEARS SINCE THEY WERE MANUFACTURED. WE CAN ONLY TEST FOR THE PARAMETERS MENTIONED ABOVE IN ONE OR MORE OF THE FOLLOWING EQUIPMENT WE USE FOR MEASURING: TV-7/U, JACKSON 648 MAXI MATCHER 2.