**** Also when calibration I set it at 120 and not the required spot so in reality this tube test about 107 **** Lot of (4) Mullard 12at7 vacuum tubes halo/O getters grey plate possible from 1960s only date code I found clear on one is B1k3 . Bought from estate sale along with others. All tested super strong and passed short and gas test on both sides I used my Sencore TC -136 tube checker Each tube are 97/97 on tester I’ve sold over 100s of vacuum tubes These are sold as is international shipping also Free shipping Will post more tubes as I go through all my inventory Please view photos closely Sold as is no returns
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