RCA Black Plate 6CG7 6FQ7 Vacuum Tube With Shields NOS NIB Interstage The two on the left

The two on the left were made by Mullard

Tube One tested 40 in Section One and 44 in Section Two

I am playing them in my Musical Paradise MP-301 MK3 as I write and they sound excellent

new in box RCA 8CX8 tube tested to spec on our Paul Hart-calibrated TV7/U

I playing Easy Star All-Stars' "Dub Side of The Moon" through my Radio Craftsmen RC-2 amplifiers and they sound outstanding

RCA Black Plate 6CG7 6FQ7 Vacuum Tube With Shields NOS NIB Interstage The two on the leftThis new old stock, new in box RCA black plate 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 an almost perfectly balanced 82 84 where minimum (65%) is 50 50 and 100% is 77 77. This tube has steel support rods; a dimpled D getter and matte black plates. There is a shield between the triodes for reduced cross talk. I have played it in my Schiit Vali 2