Matched Pair JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tubes Valves NOS NIB ECF80 T35 and if it is

and if it is

This is a new old stock

These lot of six new old stock

These seven new old stock

Tube One measured 45/40 while Tube Two measured 52/50 where minimum (65%) is 40/40 and 100% is 62/62

Matched Pair JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tubes Valves NOS NIB ECF80 T35 and if it isThis new old stock, new in box matched pair of JJ low noise 12AX7 ECC83 12AU7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: Tube One: 44 48 Tube Two: 46 48 Minimum (65%) is 32 32 and 100% 66 66. These tubes have excellent silkscreening; excellent flashing and O getters. Their filaments are spirally wound hence the "S" in "ECC83S" for low noise