JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 new in box 5GS7 tubes

new in box 5GS7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 28 while Tube Two measured 29 where minimum (65%) is 22

This lot of two RCA Cunningham Radiotron 2B7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box GE 26HU5 tubes tested to spec on our on our Jackson 648

beefy black plates: side O getters

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 new in box 5GS7 tubesThis low noise JJ 12AX7 ECC83S dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and it measured a perfectly balanced 41 41 where minimum (65%) is 32 32 and 100% is 49 49. It has excellent silkscreening; excellent flashing and an O getter. Its filaments are spirally wound hence the "S" in "ECC83S" for low noise operation. I am playing it in my Pro Ject Tube Box S phono pre