On Sat, 06 Feb 1999 23:12:00 -0600 Richard Carroll
<w0ex@scan.missouri.org> writes:
>They are probably rated for 85 degrees. One should insist on
>105 degree rated electrolytics for best results and longest
>service life, especially in amplifer power supply service.
>
>Dick W0EX
Temperature rating is only a part of the requirement Dick. Most consumer
grade electrolytics 85 or 105 C are not able to withstand the ripple
currents in a HV supply. Some of the better brands may hold up in < 1500V
supplies but that is still risky as value tolerance often requires low
value higher wattage equalizing resistors.
Stick to computer grade such as the Mallory CGS, Sprague 36D types.
Also, Industrial grade such as the CDE 381L or 381LX series are rated for
high ripple, low ESR service and 105C. I have used these for several
years with no difficulty, overheating, etc.
When it comes to HV I prefer to err to the side of safety and not price.
73 Carl KM1H
>km1h@juno.com wrote:
>>
>> On Sat, 6 Feb 1999 12:35:49 -0800 "Will K6NDV"
><k6ndv@contesting.com>
>> writes:
>> >ok......SIZZLE and BANG .....
>> >seen a few email about these caps and wonder who installed them
>with
>> >good
>> >result.
>> >I just can not belief that these caps. are not meeting any
>standard.
>>
>> They do meet a standard and work very well at those levels. Maybe
>you
>> just do not realize there are many standards.
>> Just dont expect them ( or any cap) to work way outside their ESR
>and
>> dissapation ratings. In many apps they may work quite well even
>outside
>> of their ratings...it all depends upon how far you push it.
>> Cheap and small aint often better!
>>
>> 73 Carl KM1H
>>
>> .
>> >Will, K6NDV
>> >
>> >-----Original Message-----
>> >From: km1h@juno.com <km1h@juno.com>
>> >To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>> >Date: Saturday, February 06, 1999 11:22 AM
>> >Subject: Re: [AMPS] 470uF/450v caps for $2.25
>> >
>> >
>> >>
>> >>
>> >>
>> >>On Fri, 5 Feb 1999 16:09:16 -0800 "Will K6NDV"
>> ><k6ndv@contesting.com>
>> >>writes:
>> >>>Carl, please explain the unpleasant result.
>> >>
>> >>
>> >>>Thanks Will, K6NDV
>> >>
>> >>SIZZLE and BANG
>> >>
>> >>73 Carl KM1H
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>>
>> >>>.
>> >>>>>The catalog price is 10/$40....
>> >>>>>
>> >>>>>73
>> >>>>>Bill wa4lav
>> >>>>]
>> >>>>
>> >>>>
>> >>>>These were mentioned many weeks ago when the ALL ad first
>> >appeared.
>> >>>>
>> >>>>Good luck in using them in high ripple current HV supplies;
>> >>>particularly
>> >>>>voltage doublers. I bought several ( always looking for a REAL
>> >>>bargain)
>> >>>>and tested them in a SB-220...the results were not pleasant.
>> >>>>
>> >>>>73 Carl KM1H
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>
>>
>>>___________________________________________________________________
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>> >>
>> >>--
>> >>FAQ on WWW: http://www.contesting.com/ampfaq.html
>> >>Submissions: amps@contesting.com
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>> >>Problems: owner-amps@contesting.com
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>> >>
>> >>
>> >
>> >
>>
>> ___________________________________________________________________
>> You don't need to buy Internet access to use free Internet e-mail.
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>>
>> --
>> FAQ on WWW: http://www.contesting.com/ampfaq.html
>> Submissions: amps@contesting.com
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>
___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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