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

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

This tube has 21 MM black plates

This hardcover book is in very good condition and comes from a non-smoking household

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

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