This particular set tests as average / used and are fairly closely matched, with all 4 date codes the same. These should still have a nice amount of life left in them. 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. Additional Note: The getter flash on one tube is quite a bit more faint than the others (the one testing 82% Gm), this is purely cosmetic since as mentioned above this tube still tests satisfactory and sounds nice. 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.

Got these tubes with several others in a lot that were clearly New Old Stock and appear to have never been installed! All 4 of these tubes feature the same top “Gf8″ code and the bottom codes are Delta8xx / Delta9xx which indicates they are from 1968/69 and manufactured by Philips. In this particular case they were branded for Honeywell. This set tests as NOS+ and is nicely balanced! Also the print is Extremely fragile and will easily rub off, much has already rubbed off, but special care was taken not to rub off any more while testing. The tubes’ test results are displayed in the photos New 12AU7 Spec 100% = 2,2. See the photos for physical / cosmetic condition. 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.