As @decooney indicated, the heat is not my biggest issue. It is the time to warm up. My logic is that tube amps will reach the optimum temperature more quickly than Pass Labs or other SS. Tell me if I am wrong.
@chungjh
You are correct when referring to some of the higher end amps with massive transformers. Most of my tube amps only take less than 1hr. I was a 35-year solid state amp guy, back to mono tube amps now days. Today, 45 minutes of warmup, ready to go. I simply don’t have the extra time or patience to fire up my former solid state amps and let them run for 6 hours of pre-warming for a 1-2 hour listening session. Was not worth it, IMO.
Some of the more modern output tube amp designs and tubes do not get overly hot. I can hold my hand directly on the transformers of my current Quicksilver Mono 120 tube amps for ten minutes straight. Warm, but never hot. The output tubes are warm but not scorching like my older tube amps were at times. Similar to Carver’s amp designs. Ask the designer-mfg-seller to put a laser heat gun on it and tell you what the transformer/tube temps are after 6hrs. Try the same with the Pass 250.8 at 1hr, 2hr, 6hrs and see what you get and when it sounds good to your ears. If you go with tube amps, hang on to your Pass 250.8 if you can, its a lot of fun to rotate.