Most of the heat for the CRT should be from the filament; This is what I 
found online
Vf 6.3 Volts / If 0.31 Ampere / Indirec

That amounts to about 2 watts; the anode power is much smaller.

If you provide louvers on the case so that natural convection can remove 
the warm air, you should be OK as long as there is some exposed glass 
surface area around the neck for heat conduction.

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