jamato8
Headphoneus Supremus
That is a tough one without measuring the tube. It could be going bad or it just may be a noisy tube. Sometimes it might be gassy, which can cause the hissing or the internal construction could be a little off. Some people never store their tubes on the side but keep the tubes in the upright position. Most of the time I have seen tubes on their side but I try and store my tube upright. The idea is that the internal constuction could sag over time to one side causing problems due to the very close tolerances.
I have some tubes in that I have used in my 27 preamp that are from the late 1920's that will be noisy until they are on a few hours. I would just use the good tube, if it were me. It is part of the tube world. Some are good and some brand new tubes aren't.
I have some tubes in that I have used in my 27 preamp that are from the late 1920's that will be noisy until they are on a few hours. I would just use the good tube, if it were me. It is part of the tube world. Some are good and some brand new tubes aren't.