Matched Pair JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tubes Valves NOS NIB ECF80 T35 This is a new old

This is a new old stock

I am playing them in my Mini Mite 2013 and they sound great

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

Plate current measured 20

and if it is

Matched Pair JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tubes Valves NOS NIB ECF80 T35 This is a new oldThis 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