Heat in class A equipment

I'm guessing your temp measurements are in degrees F, not C?

Hi fiesta

Yes in F 

hey are warm but not too hot to touch. Over 120 F starts getting really warm to the touch

 Unless the amp is designed badly, the heat in class A SS amps is usually confined to the output stage.  And almost all components will be fine except the electrolytic caps.   The challenge is to keep the caps as cool as possible.

As noted above, the primary source of heat in class A SS amps are the output transistors.  That's why they're mounted on the heat sinks.  However, if they are used properly and have adequate temperature control, they're probably not going to be the first things requiring maintenance.

Capacitors, in particular the ones in the power supply, will age the most rapidly.  While their eventual failure could prove catastrophic, long before then they will suffer from lost capacitance and increased ESR, which means less power available and more noise.  This is why Nelson Pass, whose primary interest is sound quality, gives different advice than a person that is just looking to get the most use for their initial outlay.

Volume level was mentioned somewhere in above post. With a class A amp, this has no bearing. The amp is running flat out in spite of the volume level, even at idle. 

 All electrolytics die in time. It is just a matter of when. Some have longer service life than others, and are rated thusly. 

 I would think that sound quality and service life could go together in a design, especially at the asking price of the component.