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Old 3rd June 2009, 01:41 PM   #11
MCampbell is offline MCampbell  United Kingdom
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Join Date: Nov 2008
Originally posted by AndrewT
I find leakage currents after slow re-forming between ten times and one thousand times lower than specification.

I asked for comment a while back, but got no replies.

I do a fair bit of reforming, so I'm very interested in your finding.

I use a GR-1617A Capacitance Bridge for reforming (mainly because it only cost me about 50) which does a fine job, and should allow me to stage to voltage.

I'm certainly going to give this a try. I'll dig out an old pair of 500V lytics and try reforming one at 500V only and the other stagewise up to 500V.

To get the results you've indicated, what increment and period have you used? Are we talking 5V increase per hour?
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Old 3rd June 2009, 02:40 PM   #12
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders



might give some clues to where I come from.
regards Andrew T.
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Old 4th June 2009, 01:36 AM   #13
glorocks is offline glorocks  United States
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Join Date: Jul 2007
OK- I raised the voltage to the +450 rating over a period of about 4 hours, bringing the voltage up 10 or so volts every 15 minutes, or when I remembered to do it.
One cap came up nicely, and when put back in the circuit worked as expected.
The second cap, although measured at the correct capacity on my cap tester, (low voltage), blew up when I got to around 100 volts. No fuse on the test rig to get in the way of catastrophy.
So it appears the second cap was the problem and was defective from the vendor. Haven't seen this before, but life is full of suprises.
Thank you all for your help and insight- all of which was most illuminating-
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Old 4th June 2009, 03:54 AM   #14
unclejed613 is offline unclejed613  United States
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i work at a company that does a lot of repair work. we recently got some caps in our "bench stock" that had one particular value (47uf/100V) that we use often, with about half of the batch mismarked for polarity. i think the clue (other than one tech blowing one up) was that the uncut leads had one long one(+) and one short one(-), with the shrink-on label reversed (i.e. the long lead was on the same side as the (-) stripe).
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
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