RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 balloon / globe Number /

balloon / globe Number / Type 36 tubes tested as follows on our Paul Hart-calibrated TV7/U:

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

Rectifier 35W4

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

This matched pair of RCA 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U

RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 balloon / globe Number /This 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