RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 I am playing it in

I am playing it in my Bottlehead Crack headphone amp and it sounds great

perfectly-matched pair of GE 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

They are dead quiet when just the amplifier is running and have excellent frequency response

new in box Sylvania 7W7 tubes tested to spec on our Paul Hart-calibrated TV7/U

100% is 56/56

RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 I am playing it inThis RCA Black Plate 7AU7 tube was tested on our Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 1950 1850 where minimum (65%) is 1430. This tube has 18 MM black, ladder plates; crenelated mica spacers; a slant D getter; steel support rods copious flashing. I have played it in my Schiit Vali 2 headphone amplifier and it sounds outstanding. It is dead quiet when the preamp is muted and has