Lifespan of a quality solid state amplifier?

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Rieff, we are systematically replacing all of the motherboards and video cards from the affected period.

Minor, so you mean physical leakage like stuff oozing out of them. The problem is they are performing below spec well before they start oozing. Since most don't have the equipment to test them some people recommend replacing after 10 years. I don't want to debate exactly how long is the right amount of time as that has been debated before but waiting until they ooze is a little too late.

take care
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Thanks Herman; Actually, it is only too late if it fails, which I have never seen happen if the units are periodically inspected and serviced. Again, like a fine automobile, if units are routinely inspected and serviced this type of problem will be detected early enough to warrant replacement of parts before failure. Another warning other than visual leakage is lose of sound quality of other electrical issues. But, as I mentioned earlier, if the unit is routinely inspected and service, even these will be detected early enough and parts replaced before failure.

enjoy

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Cathode, I don't feel it is being negative to correct a mistake. Electronics is a branch of physics. It is science. We use specific terms with specific meanings to avoid confusion. Why anyone would insist otherwise baffles me.

For example, your use of MTBF is simply incorrect. It is Mean Time BETWEEN Failures. It is not the same thing as MTTF.

Something is working.
It breaks down.
You fix it.
It works for some period of time. (this the "between")
It breaks again.

The mean of those "It works for some period of times" is the MTBF. It is not, as you stated, the length of time it takes for a certain percentage to fail.

That is not being negative. It is correcting a mistake.

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Most electrolytic caps used in power supplies will show some signs of failure before they start to leak. Most such capacitors have some sort of plug on the terminal end that will show signs of bulging prior to outright failure of the part.

Its a judgement call as to how much of that you want to put up with, IMO if you want to be safe, any electrolytic that has a bulging plug should be replaced.

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Minor I would have to disagree with "it is only too late if it fails" when it comes to audio. The statement may be true with power supplies for some equipment, but since they typically affect the sound of an amp long before they fail they have to be replaced sooner if your goal is optimal sound.

I do agree you should only replace caps in really old amps when necessary, but if we take 30 or more years to be really old then IMHO it is necessary in all of them. Bulging or oozing or not those caps have deteriorated. They need to go.

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