[Amps] Meaning of "conduction cooled"

[Bill Fuqua]

If a tube is convection, conduction, radiation, liquid or vapor phase 
cooled has to do with how heat ,produced by the kinetic energy from 
colliding electrons, is removed from the anode.  From there it may pass 
from one place to another until ultimately dissipated into the environment 
by all sort of heat transfer mechanisms.  There are some very minor points 
about this that can be argued, such as,  in the case of the convection 
cooled tubes or even the radiation cooled tubes where there is thermal 
conduction from the side of the anode where the electrons collide to the 
surface where it is dissipated. But that is a very minor point  except to 
the nitpicking purest.

73
Bill wa4lav