Leaving my amplifier on ok?

Speak to your Home Insurance and Amp's Manufacturer.

I'm sure the Insurance will happily payout for electrical fires when a Fridge or another White Goods or the like has a malfunction that results in a fire, and there is plenty to suggest it has been cared for as the Manufacturer Suggests. 

Taking advice of a forum on such matters of such unimportance can easily leave one without a home and no Insurance Payout to boot. 

It is the individual holding the insurance policy, who has a responsibility to act in accordance with how the Insurance Company deems good practices are being followed. Unpaid claims are regularly found in conjunction with abnormal practices. 

Leaving Laptops 'Permanently' Charging and then unattended, is known as a cause of fires in premises', the Insurance Companies are known not to pay out when this is a cause of a fire. 

Today leaving a Laptop Permanent Charge, might not be considered abnormal to the regular user. Leaving it unattended whilst charging for a excessive period is probably normal for many.

I left my Naim 42/110 combo on for forty years: no problem.

@pindac 

I have never heard of an insurance company not paying because of the reasons you state, do you have some examples?

Further, I’ve never heard of an audio component bursting into flames and causing a fire.  But whatever. 

Since the argument against leaving your SS amps on 24/7 is the damage caused by heat (mostly), what is the temp of your equipment both when in use and when idling?  At Idle, my Hegel H30 measures +/- 90F on the warmest part of the case and 100F is the warmest temp I can shoot inside the case.  When in operation, both go up about 10 degrees F.  It would seem my equipment would suffer more heat damage sitting in Pheonix completed turned off.