3 RCA Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three September 1 2023 This matched pair of RCA

This matched pair of RCA black plate triple mica 6CL6 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box Sylvania 8LT8 tubes tested to spec on our Paul Hart-calibrated TV7/U

The Zenith is hermetically-sealed and could not be tested

Transconductance measured 46/48 for Tube One and 48/47 for Tube Two (Sylvania-MANUFACTURED

new in box RCA 6B10 tubes tested to spec on our Paul Hart-calibrated TV7/U

3 RCA Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three September 1 2023 This matched pair of RCAThis trio of RCA black plate 6CG7 6FQ7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measure as follows: 42 61 (sic), 80 75 and 86 96 where minimum (65%) is 50 50 and 100% is 77 77 These tubes have steel support rods; top, harp shaped getters; black, ladder plates with shields between the triodes for reduced cross talk. I have played them with adapters (not