Re: Old caps...
Even more important than the electrolytics, electronic gear from the 1950's and 1960's contains many "paper" capacitors. These are sometimes referred to as "wax paper," "bumblebee," or "black beauty" capacitors. In most cases these will ALL have compromised performance after 50-60 years. DC leakage, even direct shorts, are common. Also, the uF capacitance value often changes with time. For some reason it often increases: A capacitor marked 0.1uF may measure as 0.15uF.
Check "Antique radio forums" as well as "audio karma" forums for lots of info about replacing capacitors in older gear. In some cases, collectors will remove the insides from the old capacitors and install new capacitors inside the old paper tubes. This is called "restuffing."
Regards, EB
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Re: Old caps...
Ive tried reforming before (im a valve radio geek mind you) some go bang during the process, some work, but then fail very soon anyway... if i wasn't living in central city i would be willing to come down there and see just if they would last after reform.Last edited by goontron; 10-16-2014, 10:16 AM.Leave a comment:
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Old caps...
I'm on the verge of acquiring old equipment that may have ancient 1950s-1960s electrolytic capacitors in them. It definitely would be best to simply replace the capacitors but I wonder how much luck people have had reforming them if they haven't yet shorted out?
I do have a Sencore LC meter with reform function (it can get to several hundred volts DC, measures leakage and value - too bad no ESR) and wonder what the success rate is - or should I still look into finding new high voltage capacitors to replace?
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Hello,
First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.
I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.
I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
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Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,... -
Good evening
I recently aquired a rev 1.1 Gigabyte 60XT, and was suprised of the amount of leaking caps for a motherboard of the P3 era. Especially the way the 330µf caps seems like the housing discolored even.
Now, there are some 3300µF 6.3V KZG series around the CPU. Would it be OK to replace them with something like EEUFR1A332 ? (Panasonic FR 3300µF 10V). Or was this board designed around very low ESR caps?
But I was also suprised about the bigger boys, which are 330µF 25V.
Could it be they used 25V caps because they were cheaper / available at that time?... -
I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177...
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