[FLBOATANCHORS] RE: Need Oddball Caps.

[Brian Carling]

I agree Mark - great bleeder scheme and it kills two birds with one stone.

Foltarz at rocketmail.com
writes:

>>Absolutely use the lower voltage caps. Much, much less expensive. Only drawback
is that they will typically take up more space.

I have had great success on recapping several amplifiers with 250 volt
electrolytics. 

I use an equalizing capacitor across each one. The arrl handbook says 100 ohm /
volt. So for my 250 volt caps that would be 25K ohm.

The power in the resistor at worst case is  2.5W I use a 5 watt resistor across
each cap  and all is OK.

 By the way, the equalizing resistors do a nice job for the bleeder to. Great
way to replace those huge wire wound resistors that ALWAYS open - at least on
my gear.

73

de KA4JVY

Mark




Brian Carling wrote:

>Orrin - if you don't want to buy the high priced 700V caps, you can 
>always put twop 350V ones
>in series. It's easy.  Just use a parallel balancing resistor of 
>something like 100 kilohms at 2 watts across each
>of them.
>
>If you want it to look original, expect to pay very high prices. There 
>is no one making 700V caps that
>I am aware of. Chances are that anything you buy wold be 30-40 years old 
>and fail on you anyway!
>
>Orrin Bentz wrote:
>
>  
>
>>Good Evening Gentlemen
>>
>>I am recapping a URM 25D. There are 3 4uf 650 WVDC electrolytics
>>in the power supply. I checked catalogs from Mouser, Digiky, Newark One, and
>>Antique Radio Supply with no luck at finding anything even close.
>>
>>Then I tried to see what I could put in series to achieve the needed values.
>>No luck, the voltage was always too low for the cap. value.
>>
>>Now I know there are a couple of guys around who rebuild these things,
>>but at about $30.00 a pop that would end up costing more than  I paid for
>>the 25D in the first place.
>>
>>Anyone have any ideas?  Maybe these things are so old as to not worth 
>>rebuilding
>>anymore.
>>
>>Thanks
>>
>>Orrin Bentz
>>47.1234703  -93.5748444 
>> 
>>
>>    
>>
>
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