Just over 40 years ago, I was working on the design of a 400 watt marine tx, so
needed a 1kV 1 amp supply. I was using a straight transformer - bridge
rectifier - electrolytic stack. Investigating the actual ripple current in the
electrolytics with a thermo-ammeter, I found the ripple current to be pretty
well 1.4 times the output current, almost regardless of capacitance once the
ripple voltage was down to below about 5%. I'm
sure that these days, there are plenty of programs around to calculate the
ripple current, but I use the 1.4 times usually as a rule of thumb, and haven't
been let down yet - except when using photoflash capacitors!
So your 1900mA ripple current rating may well be pushed a bit.
As Carl says, try it. On SSB with the variable load and the rest when on
receive, it may well be OK, but on RTTY or SSTV you could have a problem.
73
Peter G3RZP
========================================
Message Received: Jan 13 2014, 06:53 PM
From: "Harald" <la6lha@mimer.no>
To: "Carl" <km1h@jeremy.mv.com>, amps@contesting.com
Cc:
Subject: Re: [Amps] Russian HV Supply Capacitors
Not any link making me wiser Carl, most links to ebay ads as you also
refer to, so they may be Chinese now converted to US Made to ease sales...
As most companies have a web page these days strange I did not find
anything for TCI at least indicating they produce el caps.
But most less expensive stuff come from China these days...and we are
happy to outsource our production to them still..AND lets not forget
they make quality products as well.
Maybe I did a mistake...I guess I will find out.
Is there a quick way to test these caps ?
I received another batch of 20 today from another source:
These Nippon Chemi Con caps:
http://www.chemi-con.co.jp/cgi-bin/CAT_DB/SEARCH/cat_db_al.cgi?e=e&j=k&h=EKMM401VSN471MA40S
Did I repeat the same mistake or do the group approve they can be used
in a planned 5KV 2A CCS supply?
Harald/LA6LHA
On 12.01.2014 22:00, Carl wrote:
> Do you have any links to USA ones Harald other than JE/JEA which I
> believe are Chinese with a new skin?
>
> I found several links to Chinese TCI caps.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Harald" <la6lha@mimer.no>
> To: "Carl" <km1h@jeremy.mv.com>; <amps@contesting.com>
> Sent: Sunday, January 12, 2014 1:58 PM
> Subject: Re: [Amps] Russian HV Supply Capacitors
>
>
>> No date code found Carl...Regarding TCI I do not have a clue about
>> this vendor/manufacturer but I found some companies selling TCI
>> capasitors when searching the web. Pictured items I found indicated
>> TCI is Made in USA. But who knows these days...Maybe I will find out
>> how long they last one day..I have some spare..Anyone who wants some ?
>>
>> Harald
>> LA6LHA
>>
>> On 10.01.2014 03:34, Carl wrote:
>>> What is the date code on those caps? And why cant I find any
>>> information about TCI?
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message ----- From: "Harald" <la6lha@mimer.no>
>>> To: <amps@contesting.com>
>>> Sent: Thursday, January 09, 2014 5:43 PM
>>> Subject: Re: [Amps] Russian HV Supply Capacitors
>>>
>>>
>>>> My AMP Supply LK800 with the external Hi/Lo PAK are happy with the
>>>> capacitors I bought last year from K4POZ:
>>>>
>>>> http://swap.qth.com/view_ad.php?counter=1106596
>>>>
>>>> The price is in my humble opinion very good, and his service was
>>>> excellent.
>>>> You save a lot of money compared to the ones you refer to and even if
>>>> it is more work for you it takes much less space.
>>>>
>>>> 73 de LA6LHA/Harald
>>>>
>>>> On 09.01.2014 19:49, radio@modesgate.com wrote:
>>>>> To the un-initiated, these look like an elegant solution to my HV
>>>>> smoothing capacitor requirement. Perhaps too elegant a solution.
>>>>> Am I
>>>>> missing something? If anyone has an opinion, or direct experience of
>>>>> using these, commentary would be appreciated.
>>>>>
>>>>> http://www.ebay.com/itm/60uF-4kV-6kV-HIGH-VOLTAGE-CAPACITORS-New-Lot-of-2pcs-hv-plasma-laser-tesla-/201017069009?pt=US_Ham_Radio_Amplifiers&hash=item2ecd8d0dd1
>>>>>
>>>>>
>>>>>
>>>>> If they are any good, any info on cheaper sources (or any for sale in
>>>>> the
>>>>> UK) would also be good.
>>>>>
>>>>> 73
>>>>>
>>>>> Denis MW0CBC / GW8OQV
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>>
>>>> --
>>>>
>>>> _______________________________________________
>>>> Amps mailing list
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>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>
>>>> -----
>>>> No virus found in this message.
>>>> Checked by AVG - www.avg.com
>>>> Version: 2014.0.4259 / Virus Database: 3658/6990 - Release Date:
>>>> 01/09/14
>>>>
>>>
>>>
>>>
>>
>> --
>> 73 de LA6LHA,Harald
>>
>> “That men do not learn very much from the lessons of history is the
>> most important of all the lessons that history has to teach.”
>> ― Aldous Huxley, Collected Essays
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2014.0.4259 / Virus Database: 3658/6996 - Release Date: 01/12/14
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>
>
>
--
73 de LA6LHA,Harald
“That men do not learn very much from the lessons of history is the most
important of all the lessons that history has to teach.”
― Aldous Huxley, Collected Essays
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