I felt the same about my Mark V head. Heat soak tremendously. Almost feels like the insulator on the speaker wire is going to melt.
Changed all of the tubes (not quite sure how it would relate) but the amp has remained cool and no longer overheats. Also replaced speakers in the 412 cab that have had for 13 years.
It is obvious that the tubes will radiate tremendous amounts of heat. I can now touch the filament transformer without getting burned as well as the chassis. I am not too familiar with the Nomad, but it is a bit similar to the Mark V in some respects (then again maybe not).