New tube has a humming sound (Winged "C" 6H13C)

[nico3las2003]

Hey all, I just purchased a Winged "C" 6H13C for my bottlehead crack, but it has a humming sound that does not go away at low volume or high volume. I know the issue lies with this tube because my other tubes are dead quiet with my amp.
Is this normal?

 

[Tom-s]

Common problem with NOS tubes. Contact the seller for another.
I've got a box full of "musical" and thus unusable NOS tubes.
On another note. Some new production tubes (PSVANE 12au7) die fast too IME.

 

[JamieMcC]

On occasion I have found some NOS tubes can be a little noisy you could try leaving it running for a day or two, the noise might disappear with a bit of prolonged use.

 

[mcandmar]

....and make sure the pins are nice and clean.

 

[Paul Birkeland]

Let that tube run in the amp for 50 hours, just to be sure it doesn't settle down with some use.