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Old 21st September 2007, 12:02 PM   #1
chrish is offline chrish  Australia
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Default Big Paper in Oil Caps

Just saw these on EPay. Crazy big Russian 1KV paper in oil capacitors. Might be good for someone's project!

http://cgi.ebay.com/100uF-1000V-1KV-...QQcmdZViewItem
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Old 21st September 2007, 12:25 PM   #2
Colt45 is offline Colt45  Serbia
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Only problem is shipping is more than they cost...
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Old 21st September 2007, 01:21 PM   #3
chrish is offline chrish  Australia
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I live in Australia, so that is a fact of life for most things for us! Valve gear is heavy and costs plenty to ship. For the cheap Edcor transformers I have used, they cost as much to ship as to buy!

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Chris
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Old 21st September 2007, 04:44 PM   #4
zacster is offline zacster  United States
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Bigger than the trannies. You need a chassis just to hold them. They look heavy too. I'll bet they sound better than electrolytics.
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Old 22nd September 2007, 04:58 AM   #5
mach1 is offline mach1  Australia
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Quote:
For the cheap Edcor transformers I have used, they cost as much to ship as to buy!
Postage downunder can work out very cheap. Edcor use USPS flat rate boxes ($37) which can take up to 20lbs (lotsa small transformers). Either order a bunch yourself, or organise a bulk buy with other oz forum members.
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Old 22nd September 2007, 05:48 PM   #6
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Solen makes 51 uf 1500V PP caps that are about 2" dia by 4 and1/2" long and may have suppliers everywhere. Other than that Motor run caps are available on e-bay most places and they are good for around twice the AC voltage. I have seen 80uf 500V AC on e-bay for 12 deflating american bucks.
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Old 24th September 2007, 03:58 AM   #7
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I checked the shipping cost for a case of 4pcs... $45 to Washington state.
One question though, would these big caps. go bad after sitting a few years like smaller caps. do?
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Old 24th September 2007, 04:07 AM   #8
Magura is offline Magura  Denmark
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A piece of advice.....

Those caps must be more than 20 years old by now, so I would consider buying them to be risky business.

There are other options out there for both better and surely more reliable film caps, also bigger than 100 uF.

I have bought myself a handfull of PP in oil and a few PP in Nitrogen caps, ranging from 165uF to around 500uF as I recall. Those caps are though limited to 600V at full ripple. Reality is a lot closer to 1000V for audio use.


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Old 24th September 2007, 05:51 AM   #9
felixx is offline felixx  Romania
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I use in some projects the same russians caps.
Also I have the same type of caps,only 68uf/400V but was made early 1965.
I put them on meter and I test those.
The real value is 67.89uf.
More than that I open some of these.They are really build and are garanted for life.The oil is still there and a lot.
Comparing with other polipropilene I prefer those.But should be tested first
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Old 24th September 2007, 06:43 AM   #10
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I bought a case of 4 of these recently, and they arrived one week later in the UK. I paid $109 including shipping, which cost me 57.

I have tested all three with my LCR meter: two are 114.3uF and the others are about 116uF.

The crate was unopened and dated 1977. The caps are externally perfect.

I currently use 3x 20uF versions of the same caps in the crossovers of my speakers (open baffle fostex fe207e and eminence alpha 15a crossed over at about 275Hz). I have also tried large value polypropylenes but don't like these as much. Dynamically there is no comparison - just listen to any percussive music and the difference is clear.

I'm not sure what I'll use these new caps for yet.
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