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This particular pair tests as NOS+ and are almost perfectly matched. I pulled and matched these from a group of about 20 vintage RCA black plate 6L6GC’s of the same style and these 2 were the strongest, closest matched tubes of the entire group, and while the style of print on them is a little different, their internal construction is identical. Also one tube’s top glass dome is slightly taller than the other, but this is also purely cosmetic. One tube has a CG/1968 date code, and the other a DE/1970 code. The tubes’ test results are displayed in the photos New 6L6 Spec 100% = 6,0. See the photos for physical / cosmetic condition. Also, t he tube boxes are original reused RCA boxes, and not original to 6L6s or these tubes. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.