RCA Clear Top Red Tip Low Noise 6CG7 6FQ7 Vacuum Tube With Shields Number I wish I could tell

I wish I could tell you how they sound and from what I can suss out

They are dead quiet when the CD player is paused and have excellent frequency response

It measured an almost-perfectly-balanced 71/72 where minimum (65%) is 56/56 and 100% is 86/86

two Hytrons and one Sylvania

RCA Clear Top Red Tip Low Noise 6CG7 6FQ7 Vacuum Tube With Shields Number I wish I could tellThis new old stock testing RCA clear top, red tip (low noise) 6CG7 6FQ7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 82 91 where minimum (65%) is 50 50 and 100% is 77 77. This tube has steel support rods; a side D; a clear top with red paint (indicating it is a selected, low noise tube; gray plates and excellent flashing. There is a shield between the triodes