Lo-Fidelity
Super Member
Something's fishy with pin 5 on V15. Have you tried tightening the socket pins with a dental pick or really small jeweler's screwdriver? Give the tube pins a hit of deoxit and work them up and down the socket a few times.
Did the deoxit thing. No change. Closer look at pin 5 I see that it is connected to ground so no surprise I guess.