[R-390] My 'new' R390

[Barry]

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 

> Tomorrow I'll get it down on my bench and start work on it. Hopefully I can
> clean up the switch and get it working again.

> Does the line filter go bad on the R390s? I had to change one on my R390A. It
> would be more of a task on this with the plug for the cord.

> Thanks guys,

> Adam

> On Fri, Aug 15, 2025, 17:31 David Wise < [ mailto:d44617665 at hotmail.com |
> d44617665 at hotmail.com ] > wrote:

>> I preemptively fitted my machine with an inrush current limiter, and a snubber
>> across the switch contacts.

>> Dave Wise

>>> On Aug 14, 2025, at 6:37 PM, Norman Ryan via R-390 < [
>> > mailto:r-390 at mailman.qth.net | r-390 at mailman.qth.net ] > wrote:

>> > Hi, Adam,
>>> If you can remove the power switch, you can revive it by taking it apart and
>>> retrieving the two contacts. You may note the contacts are pitted and tend to
>>> hitch onto one another, causing them to hang. Simply smooth them with a fine
>>> toothed file and all will be well with the switch after assembly and
>> > reinstallation.
>> > Norman
>> > Adam wrote:
>> >> I brought up my recently acquired R-390 slowly on a variac. No smoke, and
>> >> it picks up stations - not quite as good as my R390A, but thats to be
>> >> expected since its been asleep for 20 years.

>> >> Power switch doesn't turn off, I'll need to find one. Local Audio is
>> >> extremely quiet unless the BFO is turned on, then it's too loud (turned all
>> >> the way down and it's still booming). Line meter also doesn't function
>> >> unless the BFO is turned on. With my Kiwa MAP hooked to IF out, it sounds
>> >> decent.

>> >> Where should I start :D

>>>> Adam K2AAMl list: [ http://www.qsl.net/donate.html |
>> >> http://www.qsl.net/donate.html ]

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