3 RCA Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three September 1 2023 5/2110 where new 6F6s measure

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

new in box Amperite 3TFV4 ballast tube tested to spec on our Paul Hart-calibrated TV7/U

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

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

Transconductance (TV7/U): 54/51

3 RCA Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three September 1 2023 5/2110 where new 6F6s measureThis 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