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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Over the years I have tried most of the dampers out there. I either got no change in sound or the sound got worse.
Alan
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.