[R-390] C553 replacement?

[Cecil acuff]

My standard for repair of the 390 series is to replace paper caps on the R-390 “as needed” based on symptoms and leakage testing, (Which is rarely) and “replace all” in the R-390A as a rule.  You can replace as needed in the R-390A but you will be replacing caps on a routine basis until all are eventually replaced.

I too have seen next to no Vitamin Q cap failures.

Cecil
K5DL

Sent from my iPhone

> On Feb 25, 2023, at 6:01 PM, John Wendler <wendlerjrv at gmail.com> wrote:
> 
> The C553 in one of my IF modules is a Sangamo Vitamin Q capacitor, 0.01 uF,
> 300 V.  It looks good visually and is not a Brown or Black Beauty of
> Death.
> 
> What's the group experience with the reliability of the Vitamin Q caps?
> 
> V/r,
> 
> JP N5CQU
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