[Amps] How Do You Know When Filter Caps Begin to Fail?

[Bob K6UJ]

Pete,

My understanding from input received on this reflector is that the electrolytic filter caps have reached the end of their lifespan and
are prone to go out after about 15 years.  This varies of course but it is good idea to change them out if they are as old as yours.
The problem with these guys is that when they go you don't normally have any pre indication and they usually go kaboom and take out
other stuff along with it.  Cheap insurance to replace them.

Bob
K6UJ



On Mar 28, 2012, at 9:16 AM, 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?
> 
> -- 
> 73, Pete N4ZR
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