RCA Black Plate 5963 / 12AU7 / ECC82 Vacuum Tube Industrial-Grade For Your Univalve Or Bottlehead 6JE6 new in box US-made 1LN5

new in box US-made 1LN5 tubes tested to spec on our Paul Hart-calibrated TV7/U

It tested 56 in Section One and 56 in Section Two where minimum (65%) is 40

new in box CBS 12DB5 tube tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 55 while Tube Two measured 60

not included) in my AC-heated Alan Eaton single-ended 45 amplifier and they sound OK

RCA Black Plate 5963 / 12AU7 / ECC82 Vacuum Tube Industrial-Grade For Your Univalve Or Bottlehead 6JE6 new in box US-made 1LN5This RCA Black Plate, industrial grade 5963 12AU7 ECC82 tube was first tested on our Paul Hart calibrated TV7 U as a 5963 as well as a straight 12AU7 and then tested on our Maxi Preamp II for shorts, gas, noise, transconductance and gain. There were no shorts, noise or gas and they tested as follows: On the TV7 U with bias set to 30 (5963) it measured 66 56 where minimum (65%) is 56 56. On the TV7 U with bias set to 24 (12AU7) it measured 86 73 where