I have two electrolytic capacitors [ Sprague Powerlytic / 36DX / 95°C / 9800uF / 100VDC / 0905L 25 ] that I had shipped to me on 01-29-10 from Allied Electronics. They have never been used [powered up], and have been well taken care of in terms of temperature storage. They are replacement caps for the power supply block of a audio power amplifier, as the current ones are very leaky. My question is: In all that I have read, as long as electrolytic capacitors have never been powered up, they have a fairly long shelf life. Does anyone have information contrary to this?? Thank you in advance for your time & consideration.
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Re: Unused/New Electrolytic Shelf life
There is no problem, especially with those big filter caps intended for audio amplifiers. If they were sitting for 5-10 years maybe you would have needed them reformed (variable voltage source, series resistor, series amp meter), watching the leakage current as you slowly advance the voltage towards their rated value. But for just a couple years they should be okay and require no preparation.A working TV? How boring!Originally posted by PeteS in CA -
Re: Unused/New Electrolytic Shelf life
Where have you read that not powering them up improves shelf life? From recollection, that's the worst case as never powering them up would cause the most oxide loss on the foil. Regardless I agree with Th3 uN1Qu3, the caps should be fine for the application.Comment
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Re: Unused/New Electrolytic Shelf life
@ 999999999 + @ Th3_uN1Qu3:
Thank you gentlemen, for your dedication to a resolution. I thoroughly appreciate your efforts. As far as where I read that "not powering up will increase shelf life", it was 2+yrs back when I purchased them, and another 1-2 years back added to that in finding the information[??] that I used to make the purchase decision. I cannot remember the "source" of the info that stance came from. After re-investigating the issue, it appears you are correct, although, some manufacturers have trouble remaining "crystal" in their statements. Should [either] you want a good read, as well as some additional knowledge, visit: http://my.execpc.com/~endlr/electrolytic.html . It is a site, "chock full of nuts", as the saying goes. In any event, I thank you for "setting me straight", as it were, and prodding me to do some additional research on my own. Kudos to you [both], and again, Thank you. ---SamComment
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do capacitors have a limited life even if just kept in a box in storage? -
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Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hi.
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Hello,
can I use this cap:
https://www.tme.eu/en/details/ues1h4...tors/nichicon/
Capacitor: electrolytic; bipolar; THT; 47uF; 50V
to replace this capacitor: Electrolytic Radial E 47uF/50V 6.3x11 RM2.5 105°C Jamicon
What exactly I can expect to install bipolar electrolytic cap instead a regular one?
Thanks. -
Hi all!
I just bought a pair of ADS L810 speakers, which I've heard are some of the best speakers from that time (late 70's) into the early 80's. I was super excited to test them out and hooked them up and I was very underwhelmed by the treble. The treble was awfully muffled. I've been doing some restoration work on 70's stereos and a couple of speakers here and there so I am really just a beginner. I do know that capacitors in speaker crossovers filter out the lows to allow only the highs up to the tweeters and mids. Inductors filter out the highs to allow the lower frequencies to...
Comment