RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 It measured 44/40 where minimum

It measured 44/40 where minimum (65%) is 50/50 and 100% is 77/77

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

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

On the TV7/U with bias set to 24 (12AU7) it measured 86/73 where minimum (65%) is 50/50

RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 It measured 44/40 where minimumThis 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