Frequency for Energizing 90s Aluminum Electrolytic Capacitors in 33-35°C Environment?

I have stored here electronic devices with aluminum electrolytic capacitors used and manufactured in the early 90s. Here the temperature varies between 33-35C. These electronic devices need to be energized for 1 hour with what frequency to prevent failures in these aluminum electrolytic capacitors caused by disuse?

I don't really understand the question.
Why an hour and not two or three.

Are you worried that the capacitors will unform? Applying power will re-form them.

If you want to "preserve" a piece of equipment by switching it on and letting it idle for an hour, do it once a month and that's it. I do this by switching on the equipment randomly for a few minutes or an hour, but at my leisure.

If the device does not work for a very long time, I switch it on through an autotransformer, gradually increasing the voltage, and I do the same with tube receivers, I have a Soviet receiver from 1957 and the electrolytic capacitors in the power supply are still working.
Regards Stanislaw.

Where I live, the temperature varies between 33-36°C, and humidity ranges from 57-67% without rain. I have electronic devices manufactured in the early 90s. What is the maximum possible interval for me to energize these devices, and for at least how many minutes to prevent failures in the aluminium electrolytic capacitors caused due to disuse?

I have electronic devices with aluminum electrolytic capacitors manufactured in the early 90s and early 2000s and at a temperature of 33-36C, humidity 57-67% and energized devices at 220v AC 60hz? I energize 1 hour what frequency necessary energy for aluminum electrolytic capacitors not problems disuse?

I have CRT TVs 29" Philco and Toshiba, consoles Snes JR, Snes Fat, PS2 Slim 90000, power supply 5v and 12v, tvbox T95 Max Plus, DVD Drive Sata internal

It's probably about the longevity of electrolytic capacitors. Well I have a 1978 radio-magnetophone and now I listen to the Beatles band. I haven't replaced a single electrolytic capacitor because ALL! are OK. Of course, if you have decades-old capacitors in your drawer, it's a good idea to mould them before inserting them into the circuit, so you don't get an unpleasant surprise.

I have electrolytic capacitors from the 1950s, used components but quite a lot are moulding nicely.
The 1990s are not that old devices. There is usually a max operating temperature stated on the capacitors, I think 85°C or 105°. In such conditions at even over 30°C they should not wear out too quickly. If you can, it's worth looking at the datasheet of the capacitors, the manufacturer often gives operating and storage times for given temperatures. To be on the safe side, you may want to switch these units on for a while once in a while.

Regards,
A.


I have old electrolytic capacitors from 50s and older, I have NOS and used, many of them are in a very good condition after keeping them under voltage for some time.
Capacitors from 90s are not so old, they are probably for temperatures 85°C or 105°C, so IMHO they won't be broken after keeping them in around 35°C, without voltage. If it is possible, look in the datasheets of these caps, manufacturers sometimes give informations about storage and working time in diffrent temperatures. But if you want to be safe and sure that everything is OK you can sometimes switch on these devices for a while.

A.

I energise these old electronic devices from the early 90s that use aluminium electrolytic capacitors for one hour (60 minutes), but I don't know the safe interval or frequency to do this in my storage conditions (33-36°C, 57-67%, 220V AC, 60Hz) and prevent failures in these capacitors due to disuse.

gamemaniaco1987 wrote:

I energize these old electronic devices from the early 90s that use aluminum electrolytic capacitors for one hour (60 minutes), but I don't know the safe interval or frequency to do this in my storage conditions (33-36°C, 57-67%, 220V AC, 60Hz) and prevent failures in these capacitors due to disuse

.

It's difficoult to say about safe freqency. I think swithing them on for one our in a month will be fine. I have old valve radios, sometimes not working for a year and this is not a problem, capacitors don't fail.

A.

In my case, turning on these electronic devices for 1 hour (60 minutes) once a year, does it work or not?

gamemaniaco1987 wrote:

In my case, turning on these electronic devices for 1 hour (60 minutes) once a year, does it work or not?

.

I think that will be OK. If you want to be safer, you can turn on twice a year or more often.

Regards and happy New Year,
A.

I had electrolytic capacitors from the 1970s /80s/90s from a demolition - they were to be thrown away. Out of curiosity I decided to mould them. I applied dedicated voltages through a 1.2k/-2W resistor (can't remember - some leading manufacturer stated so). Initially they showed high current.After 1/2 day the current dropped to 5/10 mA .Capacitance values 5000uF/50V to 50,000uF/50V.
After moulding I used in 13.8V / 25A power supply/s and 25V /15A for radio station .I compared with new freshly bought ones there was no difference Recovered and moulded mounted in power supply for radio station. Polish ELWA old formed for WP- special equipment - not to be beaten . every year gives voltage through the above resistor forms about one week and put away in a box carefully, I have good quality at hand. In electronic devices that I hardly use, I switch on the measuring instruments prophylactically every month for 1/2 hour.
And capacitors in electronic equipment from the XXXXX countries are a "ball and chain". -power supplies especially impulse power supplies I estimate 80/90% damage to electronic equipment...... factories produce 24 hours a day someone has to buy new hihi. I have a desktop computer on XP probably already 35 years , grandchildren when they come to use it fiercely. In the power supply, the board replaced capacitors
used in special equipment . Power supplies so repaired , capacitors moved away from heatsinks !!! are practically unbeatable. The problem now is the ecological tin, microcracks - soldering.
Ambient temperature at colleague's significant in such an environment there is moisture, temperature and here the QUALITY of workmanship will be the most important - climate I suspect tropical. In the 1970s, when our TV sets were shipped to Cuba, the laminates of the circuit boards were digested by bacteria. When I was working on radars, all the electronic boards were painted with special varnishes resistant to sea spray among other things, they were checked in a climate chamber by PRS, etc.
73!

I see the author has trolled several different forums with the same topic:
https://www.electro-tech-online.com/threads/question-capacitors-storage.167038/?amp=1
https://www.diyaudio.com/community/threads/ol...ctrolytic-capacitors-storage-question.421753/
https://forum.arduino.cc/t/questions-capacitors/1338973
https://forum.vcfed.org/index.php?threads/alu...tic-capacitor-in-circuit-old-storage.1251121/
https://forum.pedalpcb.com/threads/question-electrolytic-capacitor.24593/
https://community.spiceworks.com/t/question-electrolytic-capacitors/1148131

I wonder for what purpose this is, some kind of testing of each forum, an experiment? Or maybe it's just a simple bot (AI), as the same phrases and responses can attest. Obviously for the sake of deception in each forum a topic set up with a different username.
Interestingly in every forum, including the electrode, there have been a few users who have caught on and tried to hint at something there.