Re: [Amps] Drake L4-B Power supply caps

[R.Measures <r@somis.org>]

On May 25, 2004, at 7:11 AM, Partain, Chuck wrote:

> retrofitting an Drake L4-B and found the PS caps are popped.
>
> THey are 200ufd, 400v electrolytic.
>
> Looking to see if anyone has EIGHT available. 220 @450 allover the web 
> for 5$  but not
> sure of quality??

  Chuck --- If you want quality, /Matsushita/Panasonic 105ºC 450v 
electrolytics have it.  Digi-key carries them.  Unfortunately, they are 
not cheap.

> also I can find smaller, 450uf 450v ones I used in my
> Home  brew amp, what will be the outcome of replacing the origional
> caps with HIGHER capacitance values ?? going from 8-200uf to 8-450uf's?

  More C will provide little noticeable improvement.   However, more C 
means more stored energy to absorb during a glitch, so the glitch-R 
should have a higher J capacity with higher C.  For 450uF caps in a 
Drake, I would go with 2, 10Ω, 10W glass-coated resistors in series, 
spaced a quarter inch above the chassis..

cheers

> of course i know that its a higher total capacitance, but what can 
> occur if I
> do this? Both GOOD and BAD??
>
>
> Ka1mwp
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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