[R-390] Blowing B+ fuse

[Barry]

With the order for the fuses, I included new electrolytics.  I originally
figured I would replace them, but the radio seems to pretty much hum-less so
I thought the old cans were in pretty good shape.  I'll probably replace
them and do a before-and-after current test to see if that helps.

Thanks!

Barry - N4BUQ

----- Original Message ----- 
From: "David Wise" <David_Wise at Phoenix.com>
To: "R-390 HF Receiver List" <r-390 at mailman.qth.net>
Sent: Monday, July 04, 2005 2:14 PM
Subject: RE: [R-390] Blowing B+ fuse


> I'd look at the plug-in electrolytic filter caps on the audio deck,
> because high leakage is a common failure mode of electrolytic
> caps, and because it's easy.
>
> 73,
> Dave Wise (SWL in Portland OR)
>
>     -----Original Message----- 
>     From: Barry [mailto:n4buq at aol.com]
>     Sent: Mon 7/4/2005 7:12 AM
>     To: R-390 HF Receiver List
>     Cc:
>     Subject: [R-390] Blowing B+ fuse
>
>
>
>     I finally got a couple of 1/8A B+ fuses (SloBlo) and tried one of
them.  The
>     radio played for about one minute and blew the fuse.  I was running a
1/4A
>     in it before this.  I assume the 1/8A fuse should be sufficient and I
have
>     something leaking somewhere, right?  I replaced all paper caps, but
not the
>     electrolytics (yet).  I assume leaky bypass caps is the first place to
look?
>     Any other suggestions?  My other R390A is a "single-fuser" so I don't
know
>     if the B+ line is pulling more than 1/8A or not.
>
>     Thanks,
>
>     Barry
>
>
>


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