3 RCA Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three September 1 2023 Transconductance (TV7/U): 54/51

Transconductance (TV7/U): 54/51

5/2110 where new 6F6s measure from approximately 2000 micromhos or so with plate current draw in the 20s

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

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

It tested an outstanding 3000 micromhos with a plate current draw of 30

3 RCA Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three September 1 2023 Transconductance (TV7/U): 54/51This 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