Question About Tube Dampers


I have a Joule Electra tube preamp that I purchased here and it came with tube dampers on all the tubes. We all know of the advantages of using tube dampers on resonances and noise with tubes. Something I was thinking:

Are there any possible disadvantages to the sonics or performance of a preamp that you are aware of or have experienced with the use of tube dampers? Or is this always a performance positive?
foster_9
If the dampers helped the sound so much, why wouldn't manufacturers of amps or pre-amps use them? Dampers are, relative to the finished product, quite cheap.
Manufacturers of amps and preamps *do* use them. ARC has a proprietory damper for example.
Atmasphere is correct. ARC equipment is 'voiced' with the tube dampers in place. I like them a lot.