Sylvania JHS-12AT7WA 12AT7 ECC81 Vacuum Tube Milspec NOS NIB For Your Univalve Raytheon 6BC7 NOS mica snubbers (for lowered microphonics)

mica snubbers (for lowered microphonics) and excellent flashing

Here's a new old box

I am playing it it in my Bottlehead Crack headphone amplifier as I write and it sounds great

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

Tube One measured 60 while Tube Two measured 64 where minimum (65%) is 38 and 100% is 58

Sylvania JHS-12AT7WA 12AT7 ECC81 Vacuum Tube Milspec NOS NIB For Your Univalve Raytheon 6BC7 NOS mica snubbers (for lowered microphonics)This 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