12AT nos , flash at start ?

hi, is normal, when i start nagra pre, tube 12at7 make flash ?

like this

https://www.youtube.com/watch?v=PBjWmeuDurk

mati197904-03-2017 12:05am

wolf_garcia Details Discussions Posts This discussion Message User 6,767 posts 04-03-2017 at 06:57pm Copy Comment URL Report Comment Edit Delete I have a couple of sets of NOS Mullards and a large part of why I like them is the flashing on startup…they sound great also, but the flash is simply a wonderful thing. Gold Pin 6201s…el flasho mundo.