Tubes sound like a broken lightbulb


So I just bought some pretty fancy NOS tubes from a big online store. I unpacked them and notice they sound like a broken lightbulb 💡 when I handle them. Is this normal? I paid a lot for these tubes Because they were promised to be and test as brand new.

the tubes are Slyvania Jan-chs 6sN7gt / VT-231 2 rivet “bad boy” tubes

thanks for the feedback
andrewkelley

Showing 1 response by lowrider57

I agree with @lewm , give them a try. It could be part of the structure you hear, but it would not be a very loud sound.
If there is a rattling sound, it could be a small piece of the plastic base is loose inside. I’ve had a couple of these.

In any event, contact the seller and ask what he thinks it is.