Lifespan of a quality solid state amplifier?


What is the expected lifespan of a quality solid state amplifier (Krell, Mark Levinson, Anthem, Bryton, Pass Labs)? Is their any maintenance that can be performed to extend the lifespan of one of these amps?

Regards,
Fernando
128x128fgm4275
Between my buddy and I we have 3 SS amps still going strong after a combined 75+ years. All of them are 200WPC and up. Adcom, Kenwood, and Carver. The only issue is noisy volume pots on the Kenwood but I leave it at full volume all the time anyway so it is not an issue. Even the meters still work on the Kenwood and the Carver.
Kijanki, got a question. As I mentioned above, Crown rehabed my DC300A about 6 months to a year ago. I keep it around as a back up amp, but haven't turned it on since Crown checked it over. Per your post about caps drying out, can I safely plug the amp in without an input signal or a load just to get some juice running through it?? Will that keep the caps healthy?
I have an Adcom GFA-535 in the garage system that is 20+ years old and still sounds good.
The one thing that tends to "wear out" with solid-state amps is the capacitors ("caps"). In a decent amp, they tend to last many thousands of hours, therefore providing years of use, but they do fail over time.

Provided that an amp does not run really hot, like a pure Class-A design (e.g., Plinius, Gryphon, and certain Pass amps), the best way to increase longevity is to keep it powered up 24/7. The thermal cycles that a component experiences when it is turned on, whereby it heats up, and then turned off, whereby it cools down, is harmful to the internal componentry, making parts brittle over time and inducing failure. 24/7 operation does wear out caps faster, but caps are relatively easy and cheap to replace - they can be viewed like tires on a car (albeit a set of tires that gives you 300,000+ miles - caps last many years). What you don't want to have happen is output transistor failure, because they have to be matched and occasionally even go out of production - this is the most compelling reason to keep the amp on 24/7.

That said, you do not want to keep a pure Class-A biased amp, or other designs that run really hot, turned on 24/7, because high heat also degrades parts and thus can induce failure (not to mention the large amounts of electricity that Class A-biased amps consume).

Likewise, it's arguably okay to turn on and off a cool-running Class D amp, as such amps really don't experience thermal swings when turned on and off - they're always cool.

To specifically answer your question, a decent quality solid-state amp that has not been turned on and off with each listening session, and that has its caps replaced every ten or twenty years, should never fail. Of course, this assumes that the owner takes necessary precautions in the event of weather events and other hazards - equipment must be unplugged from the wall in the event of electrical storms (lightening strikes can destroy audio equipment), moved to high ground if there is a flood, protected from children, pets, house cleaners, and drunks, etc.
SS amps do sound better on 24/7,however I turn mine off every night because I see using extra power as a crime against the environment.YMMV>