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Did a quick test before installing this tube in a Ampeg VT60 where it is used as the phase inverter/driver to a pair of 6L6s. One side read 80 and the other 81 on a Heathkit TC-1 simple emission tester. Fired the amp up and great tone and was able to adjust the hum balance to a dead quite null which I could not do before. I never have any worries ordering from AES (tubesandmore.com)