What are the advantages/disadvantages of different amp topologies?

[please forgive my poor English]
Thanks ! Stupid me, there seem to be an two zeros error in my math indeed :)
Believe it or not, I do not have the faintest idea of the cost of electricity, as I live in an condo with monthly billing for owners, which include all fees.
I had checked on an official site, and read a bit quickly: the price per kilowatt hour is "13,02c€", they write. Which is 13,02...cent of euro = €0,1302 !! :oops:

So for a Nelson Pass Sit-4, turned ON 10 hours/day, the cost is €1.3/day.
For 25 days/month, 10hours/day, the cost will be €32, 55/month.
For 6 hours/day, 25 days/month, it drops to €19,53/month, which is an acceptable cost (though not quite environmentally friendly).

This changes everything.
Thank you for your careful reading !
No problem! I am just pleased to hear electricity is not quite as costly in Europe as we thought.

Of course, whether one should leave amps powered up all the time involves more than the cost of electricity. My system is all tube so I am in a different position. I turn my gear off when I finish listening. Back when I had solid state, I discovered my Classe CA-300 actually sounded best if it wasn’t powered up continuously. Other solid state equipment may behave differently.
 
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