From several lots of tubes previously purchased, here is a tested  6A6 tubes made by RCA.  This tube tests good on a Hickok 530 tube tester with meter readings of 1850/2000.  Min good = 1500; Rej=1300.  NOTE:  also including a freebie 6A6 RCA that tests low end at 1350/1650 that may give some service.