JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 I have listened to all

I have listened to all four LPs

beefy black plates: side O getters

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

This recording has a very nice dynamic range

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 I have listened to allThis 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