Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes EP Dutton New York had excellent frequency response and

had excellent frequency response and was very quiet

This matched pair of Japanese mesh plate EF86 / 6267 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box Sylvania 6BL8 / ECF80 tube tested to spec on our Paul Hart-calibrated TV7/U

28/27 and 33/26 where minimum (65%) is 18/18

Transconductance: 1492 / 1460 (New is approximately 1450)

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes EP Dutton New York had excellent frequency response andThis matched pair of RCA 6FQ7 6CG7 dual triodes was tested on our TV7 U for shorts, gas and transconductance. There were no shorts or gas and their readings are as follows: Tube One measured 61 60 while Tube Two measured 63 65 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods; ladder plates; side D getters and excellent flashing. As I write, I am playing them with adapters (not included) in my Alan Eaton single ended