Sylvania JHS-12AT7WA 12AT7 ECC81 Vacuum Tube Milspec NOS NIB For Your Univalve Raytheon 6BC7 NOS new in box milspec 5719

new in box milspec 5719 / AF5-719A tubes in this listing

Here's a new old box

new in box matched pair of RCA 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U tester for shorts

Four are American

Sylvania JHS-12AT7WA 12AT7 ECC81 Vacuum Tube Milspec NOS NIB For Your Univalve Raytheon 6BC7 NOS new in box milspec 5719This new old stock, new in box, milspec Sylvania JHS 12AT7WA (12AT7 ECC81) dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 51 56 where minimum (65%) is 50 50 and 100% is 77 77. 12AT7s are notorious for their unmatched triodes and their deviation from nominal parameters. And though this tube tests two standard deviations from the mean, it is new old stock and is