[R-390] My 'new' R390

[Adam Morehouse]

https://photos.app.goo.gl/QBcHdpDbK5Ryv9Ky9

Finally got it down on my bench, got the power, AF, IF modules pulled out,
and the front cover down.

It must've been kept in a garage, next to an old cars exhaust, the P/S and
side of the IF deck are covered in a wet greasy gunk. The rest of it looks
fairly clean so far.

Tomorrow I'll try to get the power switch brought back to life, and start
cleaning it up.



On Sat, Aug 16, 2025 at 4:23 PM David Wise <d44617665 at hotmail.com> wrote:

> A snubber attenuates or “snubs” transients. This one is 0.1uF in series
> with 100 ohms, across the switch contacts. Reduces the arc when the
> contacts open. The R-390A line filter is the module where the cord goes
> into the mainframe.
>
> Dave Wise
>
> > On Aug 16, 2025, at 11:03 AM, Barry <n4buq at knology.net> wrote:
> >
> > Tube Pullers -> Jealous  :-)
> >
> > Barry - N4BUQ
> >
> >
> >> The line filter was bad in mine too, so, many years ago, I replaced it
> with
> >> a IEC320 with integral filtering.
> >> It just fits the hole for the original filter, mounted from the inside.
> >> I cannot remember who provided the two other pictures attached, but one
> >> displays a R-390 back panel that is still original, the other gives the
> ID
> >> for the RF deck tuning slugs.
> >> To any useful purpose...
> >>
> >> 73, Jacques, VE2JFE in Montreal
> >>
> >> The line filter can go bad. In my case, it lost connection internally
> and I
> >> had to rebuild it which it wasn't very easy The box is soldered shut so
> lots
> >> of heavy iron needed to get it apart and back together. Hopefully yours
> is
> >> still okay.
> >>
> >> Barry - N4BUQ
> > ______________________________________________________________
> > 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
>