Matched Pair JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tubes Valves NOS NIB ECF80 T35 Plate current measured 20

Plate current measured 20

This is a new old stock

These seven new old stock

new in box Philco 7B5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tubes Valves NOS NIB ECF80 T35 Plate current measured 20This 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