Hi I am back with another question. I have been trying different pre amp tubes [12AU7's] and yesterday tried some Questionable tubes and one of them flashed when first turned on then ran ok, another flashed and blew a fuse. I replaced all the pre tubes with some clear tops that I have been using [fuse too] and all is good again . My Question is if a tube shorts out can that harm an amplifier?[ VTA ST-120 ]The amp is running flawless again and the new kt-120's [from Jim McShane] are very stable and sound SUPERB.thanx Scott
4 posters
flashing pre tubes, and complete failing of same.
Elrick- Posts : 71
Join date : 2012-09-02
Location : Bellingham WA
12AU7's probably not.
nmchiefsfan- Posts : 77
Join date : 2012-03-21
Some of the small signal tubes (mullards) will flash when they powered on after being cool. It is known as the "mullard flash" As for the fuse blowing, perhaps that was actually a bad tube. Here is a video of the mullard flash from youtube https://www.youtube.com/watch?v=uYXjAOW61-g
Gregg R.- Posts : 88
Join date : 2014-02-20
Age : 79
Location : Land of 11,842 Lakes
I have a matched pair of Tungsram 12au7s as the outer tubes for my VTA-70. Both flash upon start-up, the right more so. They work just fine. One website used flashing as a selling point; I think it's unimportant.
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