RCA 6080 / 6AS7 Vacuum Tube For Your Bottlehead 12L6GT NOS NIB new in box US-made 9AU7

new in box US-made 9AU7 tubes tested to spec on our Paul Hart-calibrated TV7/U

This Zaerix 6CU7 / ECH42 tube tested to spec on our Paul Hart-calibrated TV7/U

I just cleaned this four LP set on my VPI 16

-- GE 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

RCA 6080 / 6AS7 Vacuum Tube For Your Bottlehead 12L6GT NOS NIB new in box US-made 9AU7This RCA 6080 6AS7 dual triode output tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 49 49 where minimum (65%) is 36 36; 100% is 56 56. I have played it in my Bottlehead Crack headphone amp and it sounds great, with a very low noise floor and excellent soundstaging, dynamics and frequency response. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT