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Because after about then, amp manufacturers started cutting corners in major ways, which can make them not only less reliable but also harder to service, and also adding more complexity which can do the same thing.
Going the other way, about 40 years is roughly a cut-off when it becomes fairly certain that filter caps will need replacing.
Other that that it's completely dependent on the amp and how it's been used and stored.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I'm looking at a Mesa 50/50 poweramp that could've been made between 1989 and 2001, which is why I was concerned about age. The 2:50 replaced it in 2002 but I haven't seen any except for new. The 2:90 started production in 1992 but I'm not sure if I want to go that expensive/that many valves. But if I was spending near 2:90 money I'd honestly just buy a used 6505+ head instead.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Considering I'm under 30 if I've managed to retire by my 80s I'll have as many 5p valve amps as I can buy.
I do admire an optimist.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein