What happens if a valve base goes down? I've got sound through both channels but noticed the one of my right EL34s wasn't glowing. Swapped the valves around. Same position not glowing. There was a bit of rustling on that side earlier so I re sat all valves. Could I have knocked a connection on the valve seat?? Easy enough to change? Ive git a few days off and was hoping fir a few listening sessions. ..Could I remove one of the left hand valves and use it at half output until i get it looked at or is there a risk of damage?