Tube One: 99% (National Union stenciled on base with code MR IR; 56 on glass; bottom foil dimple D getter)
Tube Two: 88% (National Union stenciled on base with code MR IR; 56 on glass; bottom foil dimple D getter)
Tube Three: 84% (National Union stenciled on base with code E; 56 on glass; bottom foil D getter)
Tube Four: 100% (PHILCO engraved on base with code 5S; 56 on glass; bottom foil dimple D getter)
Tubes One & Two are matched in internal structures and codes; however, not matched electronically.
Good range is between 70 - 130 (70% - 130%) on the Jackson 648 tester. Tubes are tight on bases with no debris or rattling noise.
I have a number of Type 56s in my store, including matched pairs, please view to see if any fit your equipment needs.
View the store for more varieties of tubes for your equipment.
Tubes ships via United States Postal Service (USPS) Ground Advantage with tracking for domestic U.S. sale. International orders ship via International Shipping.
Package weighs fourteen (14) ounces.
Combined shipping always welcomed.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: JACKSON 648, TV-7/U & MAXI MATCHER 2.