JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 This recording has a very

This recording has a very nice dynamic range

I have listened to all four LPs

where minimum (65%) is 36

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

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

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube With Box August 03 2022 This recording has a veryThis 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