(3) GE 12AT7WA 6201 Tubes - matched pair plus one NIB, $30 for all three.One matched pair of GE 12AT7WA 6201 Tubes, plus one New In Box GE 12AT7WA. All have gray plates and large halo getters. All have been tested on my professionally-calibrated Hickok 539B tube tester. Minimum transconductance for a good 12AT7 tube on this tester is 2500 umhos. The matched pair are from the early 1960s, white lettering versions. The third New In Box one is green lettering and from 1964. Transconductance values for the matched pair are: 2900/3100; 2950/3000. The New In Box tube tests at: 3500/3700. I can mail these within the U.S. by USPS First Class Mail for $4.00 or by Priority Mail for $6.95. Pay Pal adds 3% for domestic sale and 4.5% for sale outside the U.S.
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