RCA 12AU7 12AU7A ECC82 Vacuum Tube NOS-Testing Black Plate Slant D Getter For Your Univalve Or Bottlehead VR150 T31 They have great bass and

They have great bass and sparkling highs and Mann's voice is warm and clear as a bell

I am playing them as I write in my Radio Craftsmen RC-2 monoblocks with RCA Living Stereo's CD of Bartok's "Concerto For Orchestra

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

This tube has 21 MM black plates

and as I test new-in-box 5963s

RCA 12AU7 12AU7A ECC82 Vacuum Tube NOS-Testing Black Plate Slant D Getter For Your Univalve Or Bottlehead VR150 T31 They have great bass andThis 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