Lot of 6SN7GT vacuum tubes. The 6SN7GT:RCA tubes test the following:. 74/68, 71/71, 70/71, 72/72, 69/68 and 72/72. The Westinghouse tests 69/69, VT 231 Sylvania tests 70/70 and the Raytheon tube tests 70/69 on my NRI Professional Model 68 Tube tester.

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