Warm-up time for amps and preamps

I’m running a Class D Taranis by Merrill Audio. Got a bit concerned by rvpiano’s tech’s comment about "on with no input signal" being bad for Class D. 

There is absolutely no reason why running without input signal would be bad for any class D amp.  This strange advice was given by NuForce technician?  Are they still in business?

rvpiano, I second you on the Scotch - very effective.

It is simply drying out of electrolyte.  Every 10 degrees Celsius temperature increase cuts capacitor life by half.  Presence of voltage on capacitor is beneficial since it is rebuilding dielectric layer (aluminum oxide).  Without voltage electrolyte slowly eats up this layer.

Properly designed electronics doesn't have components under a lot of stress.  There is a lot of industrial and commercial electronics that stays on for decades including home phones, elevator controllers, phone switchboards, cellphone towers etc. Pretty much all cellphones are on 24/7.  Failure is usually caused by external conditions (heat, mechanical stress, water condensation etc).  Test equipment, my company made in 70's, still works today after more than 4 decades of continuous operation.