Sylvania JHS-12AT7WA 12AT7 ECC81 Vacuum Tube Milspec NOS NIB For Your Univalve Raytheon 6BC7 NOS These tubes have excellent frequency

These tubes have excellent frequency response

mica snubbers (for lowered microphonics) and excellent flashing

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

67 and 71 where minimum (65%) is 46

Sylvania JHS-12AT7WA 12AT7 ECC81 Vacuum Tube Milspec NOS NIB For Your Univalve Raytheon 6BC7 NOS These tubes have excellent frequencyThis 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