On 2012-03-28, at 12:16 PM, Pete Smith N4ZR wrote:
> I have an SB-220 that dates at least to 1978. There is no external sign
> of any problems, and the amp has been heavily used in contests for at
> least 20 years. It still delivers over 1300 watts on 80-20. Is there
> going to be any warning of a capacitor failure? Will there likely be
> any cascading damage to other components? Is it conventional wisdom that
> I should replace them as a precaution?
>
Hi Pete,
When the filter caps in my filter string started to expire, one by one, the
fuse in the 2.5 KV power supply would simply blow...
I finally grew tired of replacing them one by one, & simply wholesale replaced
all of them. Surprisingly, the caps lasted some 32 years---but electrolytics
seem to be like lightbulbs in that they all "age" at surprisingly the same
rate. I guess once you lose one, "...it's time"!
~73~ de Eddy VE3CUI - VE3XZ
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