[R-390] Troubles.

[Walter Wilson]

Perhaps one of the two large caps in the Audio Deck.

On Mon, Jan 2, 2012 at 7:47 PM, Dave Mayfield W9WRL <wrl at gwltd.com> wrote:

> I have an R-390a that has not been turned on in a year or two. Yesterday
> I turned it on, and after about 30 seconds the fuse blew, I noticed when
> it was warming up that there was no audio hiss, or any other normal
> sounds. I did also notice that just a split second before the fuse let
> loose, that the slight hum from the power supply got louder then the
> fuse went.
>
> I replaced the fuse and same thing happened.
>
> I then pulled the power supply and replaced it with a know good one,
> same thing fuse popped after about 30 seconds.
>
> I checked all tubes, and found a few weak ones, I was hoping to find one
> that was shorted after warm up.
>
> I then unplugged the IF deck, replaced the fuse and turned it on, same
> thing 30 seconds and pop.
>
> Any ideas, seems like a cap somewhere to me, but I'm no expert, any
> ideas????
>
> --
>  73 Dave W9WRL
> www.w9wrl.com/w9wrl
>
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>