aluminum electrolytic capacitors have a slow leakage current and manufacturers recommend energizing them after 2 years
If aluminum electrolytic capacitors are used and manufactured in the early 90s and assembled in an electronic circuit, does this recommendation not work?
Ignoring your double negative
Yes this works.
This is known as reforming the dielectric and should be done on all capacitors that have spent a longtime not being powered up.
You may want to watch out for "capacitor plague" on those manufactured around that time.
If I have any doubt i simply replace them. They are much cheaper then replacing parts they caused to fry.
I thought that an aluminum electrolytic capacitor used and manufactured in the early 90s had its chemistry very altered and the leakage current increased faster than a new aluminum electrolytic capacitor the current increased slowly to support two years without energized so I thought that this recommendation of turning on electronic devices once every year or two years did not work for capacitors used in the 90s
You thought wrong. It entirely depends on what capacitor you got in the first place. There was no era where all capacitors were bad.
This is very good advice.
The oldest console I own is the SNES manufactured in the early 90s, I have CRT TVs from the early 2000s and new Chinese power supplies and new devices all devices with ecaps, the manufacturers of aluminum electrolytic capacitors recommend energizing the devices within 2 years to prevent capacitor failures due to disuse but I don't know if this applies only to new capacitors with little use or also to the SNES made in the early 90s and with aluminum electrolytic capacitors, the chemistry of these capacitors is different from the chemistry of new capacitors, does the current leakage increase faster in old caps requiring less than 2 years?
It is a waste of my time trying to educate you any further. You are simply not paying attention.
So carry on believing this and I will just leave you alone. OK?
It's very simple.
There are good capacitors and bad capacitors. It has always been this way. You generally only find out which you've got years down the road.
There's also good luck and bad luck. This has always been the case.
On average, number of failures in components tend to increase with age. Then again: good caps vs bad caps, good luck vs bad luck.
So your 1995 SNES may still work fine in 2037 even if you forget to power it up from time to time. Your 2002 computer you built yourself may have kicked the bucket long ago due to capacitor failure. The Arduino project you build today may live for decades, or it may be broken in 3 years. Who's to say?
Regardless, aluminum electrolytic caps have not changed much conceptually speaking. (Re)forming them may be a good idea, although the effort involved needs to be seen in relation to the utility and required service life of the device. Whether its worth it to go through all the boxes of random stuff every two years to power on derelict devices, power supplies etc only you can decide.
energize two years for old devices is ok good or no?
Long story short:
Nobody knows!
Maybe you can get educated guess from someone but there will be few people with needed experience.
My (uneducated) guess: it may be worth to try to turn on the device every year or two - at least you know if it still works and it may help the caps to work longer.
Good luck, bad luck. Who's to say what you're going to get? Life's a box of chocolates!
You've received some general advice. I recommend you read up on how electrolytic capacitors work and then try to base your own preferred course of action on it. It's up to you to decide how deeply you want to research this, how often you want to keep asking the same question and getting essentially the same answer, and how often you want to take your old equipment from a shelf and power it on.
One more thing: I've always learned that to properly reform capacitors on old equipment, they should be very gradually powered up. For equipment like a SNES this would mean you'd have to dismantle it, remove the capacitors, reform them using a bench power supply and them put them back in. Alternatively, plug in the device whenever you need it. If it says "BOOM-fhzzzzzzzzssshhhh", figure out if it can be repaired. If it starts up as intended, say a little prayer and rejoice in having another great day in paradise.