JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 Tube One measured 28 while

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

where minimum (65%) is 36

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

new in box matched pair of RCA 6GU7 dual triodes was tested on our Jackson 648 Mutual Conductance tester for shorts

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 Tube One measured 28 whileThis 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