TOTL cool running amps with fast 'warm up' time?

Is this for your Yamaha's?  I assume you are looking for long term flexibility to work with those and Wilson/Magico/YG etc....?  

Check out the AVM Ovation MA8.3 Monos.  I have a customer who has them and a pair here with me and they sound great relatively quickly and don't seem to run that hot.  

Price is insane but check out Naim Statement gear.  I have a friend who is running it with Magico M series speakers.  

I have casual experience with Boulder/Constellation/Burmester but all are wonderful.  Don't know about warm-up time on them.  

Thanks for those suggestions. This is for a theoretical end game system down the road. For now very happy with pass labs. If pass didn't generate so much heat though i'd prob stop right here. I may still end up staying here and accepting the heat because the sound is amazing.
Don't know much about AVM, will look into it.

The only amps I have ever liked run hot.  I  put the amps under the floor in the basement. 

AVM is a pretty cool brand.  They do a lot of hybrids and have a unique tube made for their input stages.  Udo who owns the company is an ex-Burmester guys so you get an idea of what to expect.  

Visually it is a little different.  They do a lot of clear tops and one of their all-in-ones used to be available in a completely clear case.  They show with a whose who of speaker brands.  

Stay with the Pass amps. It is very hard to do better, easy to do worse.

Look at Clayton Audio amps.  Class A but they have a low-bias switch so you can leave them on without heating the house or blowing up your electric bill. 

Rowland M925. Run very cool. I leave my on all the time except when I travel or when there is lightning in the vicinity.

Ya  rowland and boulder seem interesting. 

@mijostyn did you hear either? 

@soix will look into clayton