RCA 12AU7 12AU7A ECC82 Vacuum Tube NOS-Testing Black Plate Slant D Getter For Your Univalve Or Bottlehead VR150 T31 and as I test new-in-box

and as I test new-in-box 5963s

The pressing is quite quiet and I would give it an 8-8

They are dead quiet when the preamp is muted and have excellent frequency response

This Majestic number / type 55 tube was tested on our Paul Hart-calibrated TV7/U for shorts gas and transconductance

It has very light surface noise

RCA 12AU7 12AU7A ECC82 Vacuum Tube NOS-Testing Black Plate Slant D Getter For Your Univalve Or Bottlehead VR150 T31 and as I test new-in-boxThis new old stock testing RCA black plate 12AU7A dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. This tube has 17MM black plates; a slant D getter; steel support rods and nice flashing. It measured 70 82 where minimum (65%) is 56 56. I have played it in my Bottlehead Crack headphone amplifier and it sounds terrific. It is dead quiet when the volume is muted and has excellent