Pookie,
My Vac Preamp did the same thing with My 12AU7's. I took them out and swapped postions and pulled and reinserted a few times and the tubes work fine. You may have had a pin not making proper contact. I am curious has anyone compared the 8416 variant to the 6922/7308 variant? Is there any sound difference?
Johnny
My Vac Preamp did the same thing with My 12AU7's. I took them out and swapped postions and pulled and reinserted a few times and the tubes work fine. You may have had a pin not making proper contact. I am curious has anyone compared the 8416 variant to the 6922/7308 variant? Is there any sound difference?
Johnny