RCA Black Plate 6CG7 6FQ7 Vacuum Tube With Shields NOS-Testing Number Type 30 new in box milspec DuMont

new in box milspec DuMont 6X5GT rectifier tube tested to spec on our Paul Hart-calibrated TV7/U

This Raytheon 2B7 tube tested to spec on our Paul Hart-calibrated TV7/U

They measured 31 and 32 where minimum (65%) is 28 and 100% is 43

It has rectangular mica spacers

RCA Black Plate 6CG7 6FQ7 Vacuum Tube With Shields NOS-Testing Number Type 30 new in box milspec DuMontThis new old stock testing 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 a perfectly balanced 80 80 where minimum (65%) is 50 50. This tube has steel support rods; a harp 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 headphone amplifier and it sounds