Matched Trio RCA 6FQ7 / 6CG7 Vacuum Tubes Number Sextel 64 and 70 where minimum

64 and 70 where minimum (65%) is 49

This GE 3CZ3A tube tested to spec on our Paul Hart-calibrated TV7/U

Tube One drew 30

clear recording with sparking highs and nice bass

It sounds excellent with only the very-occasional pop and tick in the quiet musical passages

Matched Trio RCA 6FQ7 / 6CG7 Vacuum Tubes Number Sextel 64 and 70 where minimumThis matched trio 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 66 71 while Tube Two measured 68 67. Tube Three measured 70 70 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