Matched Pair General Electric GE 5814A 5814 ECC82 Vacuum Tubes 1st Quarter BW11 It comes with a box

It comes with a box

though is not recommended for this headphone amp which was designed for 12AU7s

Transconductance measured 2850 micromhos for Tube One with a current draw of 21

new in box RCA 6FJ7 tube -- and another just like it -- tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 5814A 5814 ECC82 Vacuum Tubes 1st Quarter BW11 It comes with a boxThis matched pair of milspec industrial GE 5814A 12AU7 ECC82 dual triodes was tested on our Hickok 800 for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 1900 1900 while Tube Two measured 1900 2250 where new nominal is 2200 They have gray plates; steel support rods; excellent flashing; top chamfered solid O getters and two additional vertical support rods for increased rigidity and lowered microphonics. I have played