[R-390] Dead R-390A

[Jim M.]

Check the ballast tube (3TF7 I believe) on the IF module.  It regulates
the filaments to the BFO and PTO tubes.  If it burned out, you would get
no signal.  Also the little rectifier tubes on the power supply seem to
be prone to failure (at least mine are).

"Paul H. Anderson" wrote:
> 
> On Fri, 20 Dec 2002, John Page wrote:
> 
> >      Well, I am about to begin my R-390A school. I have had my R390A for
> > about 2 years now and it has always worked great. Left it on the other day
> > by mistake. It was on maybe 4 days straight. Well now all I get is a faint
> 
> Leaving it on (not standby, but regular ON) is fine - year around, in
> fact as long as it stays reasonably cool.  I think in the military, they
> were assumed to be left on continuously with tube changes every six
> months.  Folks on this list have carefully rebuilt theirs and left them on
> for more than a year with no troubles.  A few days is no big deal.  Helps
> it dry out anyway!
> 
> > hum from the speaker. Man I dread pulling that thing out of its cabinet.
> > Have worked on a lot of Collins 75A types but this is going to really be
> > new.
> 
> >      Does this receiver have a time delay relay? It has always been dead for
> > over a minute and then I hear a click and it comes to life. Now no click and
> > of course, no signal. It seemed as though an antenna relay was pulling in.
> 
> There is an antenna relay - it should click immediately when you go from
> standby to on.  It should turn off when you go to calibrate.
> 
> There should be no delay unless by some chance someone added something to
> accomplish that, but I have no idea why they would.  I'd lean more towards
> a sticky or underpowered antenna relay.
> 
> >      Guess I better go find a manual and see what I can learn. Wish me luck
> > and all help welcomed. John
> 
> Make sure you get the Y2K R-390A manual - that will be a great place to
> start.  Search the archives in qth.net for Y2K and you should find it
> rapidly.
> 
> Paul
> 
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