12ax7WA

What does the WA stand for?

qdrone02-22-2015 8:14pm

tls49 Details Discussions Posts This discussion Message User 1,351 posts 02-23-2015 at 05:11am Copy Comment URL Report Comment Edit Delete Manufactured for the military.
qdrone OP Details Discussions Posts This discussion Message User 1,041 posts 02-23-2015 at 08:14am Copy Comment URL Report Comment Edit Delete Thanks I did some research and found the W stands for Military use and the A for first run B denotes 2nd run C for third run. Thanks for chiming in.
timrhu Details Discussions Posts This discussion Message User 2,779 posts 02-23-2015 at 01:45pm Copy Comment URL Report Comment Edit Delete I received a pair of Sylvania 12AU7WA tubes in the little white boxes with the Federal Stock Number stamp a while ago. Holding those boxes in my hand transported me back to my early Air Force days in 1974. Not sure if it was the memory or the sound but they are my favorite 12AU7 tubes.