3 Westinghouse Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three Isherwood This RCA 0A3 tube tested

This RCA 0A3 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box Raytheon 6AL11 tube tested to spec on our Paul Hart-calibrated TV7/U

Tube Two lacks most markings and I believe it was military surplus and had its markings removed as memories of the war were a little too fresh

but the spine is in fine shape with no loose pages

tell you how the tube sounds

3 Westinghouse Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Lot Of Three Isherwood This RCA 0A3 tube testedThis trio of Westinghouse 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: 66 65, 72 76 and 92 90 where minimum (65%) is 50 50 and 100% is 77 77 These tubes have copper support rods; top, harp shaped getters and shields between the triodes for reduced cross talk. I have played them with adapters (not included) in my Radio