Best tube dampers that you have used


I currently have a Thor Audio monoblocks TP-150, 8  EL-34's Sovtek tubes for each amp.
Was wondering in anyone's experience will tube dampers improve the sound quality.
Am hesitant to proceed as I have read that  tube dampers can melt from the heat of the tubes and sometimes
cause smoke. Any thoughts would be appreciated.  
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Geofkait is correct. No tube dampers is best. Tubes should not be in contact with ANYTHING during operation and dampers is just a little cash calf.
I use ribbed silicone condoms, they enhanced the FR of 300B's and increase 2nd harmonics. I can definitely hear the difference nearly as much as my Nordost Leif... as an added bonus they dampen the cooldown pings and crackles.