63V caps, 62V B+ PSU ehh

limono · 1st April 2011, 11:33 PM

Thin ice but I have 62V power rail in subwoofer and only 63V (10,000uF) rated caps around to do "quick & dirty" repair . The caps are respected Nippon-Chemi-Con and they are replacing some bubly 100V chinese jobs. Not perfectly comfortable situation and I wonder how long the new caps have a chance to play being exposed to almost 100% rated voltage. TIA

Richard Ellis · 2nd April 2011, 12:24 AM

The chances of it "playing" will be a matter of minutes..........It might up & just 'blow' when you first power it up.
Find the 100V version.........you will just be wasting your time, effort & a handful of caps.

_________________________________________________R ick..........

wintermute · 2nd April 2011, 12:29 AM

The main problem likely to be faced is mains fluctuations. If your mains goes 10% over (certainly within the realms of possibility) then you will be running them at around 68V. 75V or 80V caps should be considered as a long term repair, 100V seems a bit of overkill for 62V rails

Tony.

wintermute · 2nd April 2011, 01:33 AM

Just saw Richard got in before me, the comment about 100V was related to the 100V originals not to Richards comment. My general rule of thumb is 20% over rated as a minimum. If there is no huge cost (or size) penalty going to 100V then there is no harm in having the extra safety margin

Tony.

5th element · 2nd April 2011, 01:35 AM

I agree with Tony. If the cap is rated at 63 volts and you never give it more then 63 volts it should work flawlessly for the specified life span. A well made 63v cap isn't exactly going to explode either if you go over this value by a volt or five, however I would expect it's life span to suffer as a result. Depending on the variations that you can expect on the mains line, this might go a bit too high beyond a comfortable limit. If you want, check the voltage that the cap will be subjected to say at midnight, this shouldn't be too far away from a realistic maximum

The cheapo Chinese caps could be a good example of using an underspec'd cap for a specific job. They don't explode, but they don't exactly last long.

limono · 2nd April 2011, 02:47 AM

OK , I put them in and they play comfortable for a few hrs. My main is already high at 123V so it's unlikely it will go higher. I will source 80V ones or so once I'll be making an order or something pops out. So far so good. Thanks ya all

1st April 2011, 11:33 PM	#1
limono diyAudio Member Join Date: Mar 2007	63V caps, 62V B+ PSU ehh Thin ice but I have 62V power rail in subwoofer and only 63V (10,000uF) rated caps around to do "quick & dirty" repair . The caps are respected Nippon-Chemi-Con and they are replacing some bubly 100V chinese jobs. Not perfectly comfortable situation and I wonder how long the new caps have a chance to play being exposed to almost 100% rated voltage. TIA

2nd April 2011, 12:29 AM	#3
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	The main problem likely to be faced is mains fluctuations. If your mains goes 10% over (certainly within the realms of possibility) then you will be running them at around 68V. 75V or 80V caps should be considered as a long term repair, 100V seems a bit of overkill for 62V rails Tony. __________________ Any intelligence I may appear to have is purely artificial! Some of my photos

2nd April 2011, 01:33 AM	#4
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	Just saw Richard got in before me, the comment about 100V was related to the 100V originals not to Richards comment. My general rule of thumb is 20% over rated as a minimum. If there is no huge cost (or size) penalty going to 100V then there is no harm in having the extra safety margin Tony. __________________ Any intelligence I may appear to have is purely artificial! Some of my photos

2nd April 2011, 01:35 AM	#5
5th element diyAudio Member Join Date: Oct 2002 Location: England	I agree with Tony. If the cap is rated at 63 volts and you never give it more then 63 volts it should work flawlessly for the specified life span. A well made 63v cap isn't exactly going to explode either if you go over this value by a volt or five, however I would expect it's life span to suffer as a result. Depending on the variations that you can expect on the mains line, this might go a bit too high beyond a comfortable limit. If you want, check the voltage that the cap will be subjected to say at midnight, this shouldn't be too far away from a realistic maximum The cheapo Chinese caps could be a good example of using an underspec'd cap for a specific job. They don't explode, but they don't exactly last long. __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!

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2nd April 2011, 12:24 AM	#2
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	The chances of it "playing" will be a matter of minutes..........It might up & just 'blow' when you first power it up. Find the 100V version.........you will just be wasting your time, effort & a handful of caps. _________________________________________________R ick..........

2nd April 2011, 02:47 AM	#6
limono diyAudio Member Join Date: Mar 2007	OK , I put them in and they play comfortable for a few hrs. My main is already high at 123V so it's unlikely it will go higher. I will source 80V ones or so once I'll be making an order or something pops out. So far so good. Thanks ya all

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