Could it be a bad tube and a resistor burning? Happened to me.
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On the PrimaLuna amps, as I think Art Dudley noted at one point, the stock tubes have kind of a smoky smell when they warm up. If you have to put your nose right up to the tubes to smell it, I wouldn't worry too much. If you can smell it from your listening chair, then maybe it's time to replace the tubes -- or have the entire unit checked out.
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,
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.