Tube smell?


Some 5687 tubes I just installed have a mild but definite
burning-rubber odor. It's not extreme, but it is there
if you sniff around them (and I can also detect it around
the room). Has anyone ever had this? Could it be something
oxidizing because they are newly installed?

It's a bit hard to tell, but it seems to be all 4 of them,
not just one.

The tubes work fine, but look brighter than
my old cheaper 5687s. They sound absolutely great,
nice and smooth and mellow.

It's not the amp, as the old tubes don't smell.

Thanks for any help.
rgs92
Thanks everyone. The aroma has been reduced significantly
after about 8 hours of use, but is still present near the amp.
It is definitely the tubes, not the amp, as the tubes
are fully exposed atop the amp, and the original Phillips
tubes had no smell at all, even close up. These are
Tung-Sols. Yeah, I guess I'm with Pbb's comments above,
and I'll need to learn to love it. Boy, these TungSols
sound amazing--mellow and smooth but soooo non fatiguing,
really magic.
could it be that you have counterfeit tubes? if that's the case the ink they used to relabel the tubes may be burning off and projecting that smell.
Sounds weird, but it is remote possibility......
There was probably something deposited on the glass. I have seen this with NOS tubes many times. If I were you I would pull the tubes and wash them carefully so that the glass is squeaky clean. Use only the slightest amount of dish soap. Avoid getting water on the base.

Dry the tubes carefully before reinserting them in the amp!

Its a good idea to clean the envelopes in this way at least once every year. Dust and fingerprints (and smelly rubber contaminants) will shorten the life of the tube due to heat. The tubes will get rid of their heat most effectively if the envelopes are clean.
Hey Atmasphere--Thanks!! I rubbed them with
a damp tissue and it actually worked! There is
now only the slightest aroma very close up.
It may have been just one of the four, but
I cleaned them all. I really appreciate your help.
Now my wife won't complain.