[R-390] R-390-A problem

[Barry]

Hmmm, I count 6.
Barry - N4BUQ


 On Wed 02/02/11  3:27 PM , Robert Moses rhmoses at earthlink.net sent:
> Four best? That was five!  ;-)
> 
> BTW the discussions even if covered in the manuals, etc. are great!
> 
> Steve Toth wrote:
> 
> >FWIW: Encountered  a couple of similar problems
> recently restoring an HQ-129X:>1.) Warbling on the BFO.  Went away when I pushed
> sideways on the converter tube (6K8).  Turned out the converter filament
> ground wire looped through the ground lug and touched the ground lug on the
> tube socket but was never soldered (apparently at the factory as it was
> completely clean) resulting in constant fluctuating filament connection. 
> Soldered it and resolved the issue.>2.) Loud static/popping/crashing when adjusting one
> RF coil during alignment.  Duplicated by pushing on the coil form.  Two
> solder connections on the coil form had gone bad after 60 years -
> resoldered the connections and problem resolved.> 
> >The four best troubleshooting tools available to
> you:  your brain, your nose, your eyes, your ears. My two cents.>
> >
> >
> >
> >
> >
> >
> >
> >-- Steve 
> >"Think Quickly, Speak Slowly, Work Diligently, Live
> Simply">
> >--- On Wed, 2/2/11, wli wli98122 at y
> ahoo.com> wrote:>
> >
> >From: wli wli98122 at y
> ahoo.com>>Subject: Re: [R-390] R-390-A problem
> >To: youngbob53
> @msn.com>Cc: "R390A" r-390 at m
> ailman.qth.net>>Date: Wednesday, February 2, 2011, 8:24
> AM>
> >
> >I, too, was frustrated when my audio volume suddenly
> faded after being in operation for 5-30 minutes. I got led down the *garden
> path* thinking that being powered up had something to do with the cause.
> Not so. There a poor electro-mechanical connection in the phono plug.
> >
> >When the SAME phenomenon occurred a decade later: it
> was a loose screw on the speaker terminal strip causing an intermittent
> !>
> >W. Li
> >
> >
> >      
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> >      
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