BTw, Douglas Self was the same who said distortion in caps drop significantly with use.
Philips bulb promised a 15000 hr lifespan. My office bulbs are turned on only once just like my amplifier for about 8 hours 5 days a week. Roughly about 250 days a year. The math says it should last me 7.5 years. Any of you have bulbs last that long? OTOH, my Sharp mini compo which was bought in 1994 is still working (except for the CD). It is always left on in standby mode.
When I used the bulb as an example, I wanted to draw an analogy why it is better to leave equipment in standby mode (if you have them) rather than shutting them off. As far as I know, no one bakes an amplifier after assembling them. If you know how to measure the bias current, you will notice the difference at various temperature.