RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 new in box Sylvania 7W7

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

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

This EP is a music sampler recorded in Soviet-occupied Lithuania in 1963 featuring Shostakovitch

Rectifier 35W4

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

RCA Black Plate 7AU7 Vacuum Tube For Schiit Vali 2 RCA JAN-CRC-12SW7 new in box Sylvania 7W7This 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