Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes Valves Matched Pair 6SD7 Tube Three measured 76/76 where

Tube Three measured 76/76 where minimum (65%) is 50/50 and 100% is 77/77

new in box RCA 5726 tube -- and one other similar to it -- tested to spec on Paul Hart-calibrated TV7/U

They are exactly-the-same on the inside with the exception of the top mica spacers

H2E and K1E date codes

new in box GE 1821A / Z-1879A is still sealed in its plastic baggie

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes Valves Matched Pair 6SD7 Tube Three measured 76/76 whereThis 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 60 56 while Tube Two measured 61 58 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 Radio Craftsmen RC 2