[R-390] I sense a little SPARK! is back

[John Kolb]

On Wed, 28 Jan 2004, K1KQ wrote:

>
> OK, now a question to the "Underpaid Research Group" (URG). I have
> decided to take the conservative approach with respect to C533 and
> replace it on my newly acquired '55 Collins R390A that has been in an
> attic for 15 years. Mouser did not have any of the Orange drop 600v
> caps, so they sent me some 0.01ufd 400v & 800v Vishay/Sprague Orange
> drops, which should I put in? I also read somewhere a recommendation
> that as long as you are at it you might consider putting 2 in parallel
> for back up.
>

Well, that should be two in series, not in parallel. If in series
and one shorts out, the other one still prevents DC current from
flowing. A single 800 V cap sounds safer than one 400V cap, but
two 400V caps would be better than one 800V cap.

John