[R-390] Blown B+ Fuse - Cont'd

[Leland Bahr]

Fuses wear out and blow for that reason besides protecting a circuit. 
Surges and vibration also take their toll on a fuse besides just the every
day daily current flow throught the fuse.  
Same thing is also true about circuit breakers.  Just like a light bulb,
they go bad in time.
Lee
w0vt


> [Original Message]
> From: Barry <N4BUQ at aol.com>
> To: R-390-List <R-390 at mailman.qth.net>
> Date: 7/9/2005 1:56:06 PM
> Subject: [R-390] Blown B+ Fuse - Cont'd
>
>
> What I can't figure out is why a 1/8A fuse would have blown under these
> conditions.  A fast-acting fuse might have sensed a very sudden surge that
> these meters would not have shown, but these are slow-acting fuses.
>
> Has anyone done any tests to see how much current the typical B+ fuse is
> carrying?  As I mentioned, one of the filter cans is getting just a bit
> warmer than the other one so it could be drawing a bit more than normal. 
I
> plan to replace these with modern equivalents and see what effect it has
on
> the current situation (no pun intended), but I was wondering if anyone
else
> has experimented here.
>
> Thanks!
>
> Barry - N4BUQ
>
> _