[R-390] R-390 (non-A) Sudden and New Issue

[Jordan Arndt]

Out of curiosity, was the AC input filter rebuilt or replaced when it was 
restored..?

73...Jordan VE6ZT



----- Original Message ----- 
From: "Alex Hopper" <ahopper0216 at gmail.com>
To: "R-390 Mailing List" <r-390 at mailman.qth.net>
Sent: Thursday, February 26, 2026 11:46 AM
Subject: [R-390] R-390 (non-A) Sudden and New Issue


> Hi Folks,
>
> I have an R-390/URR (non-A model) that was restored by someone last year -
> the individual who restored this set is quite competent and did good work.
>
> Over the last few days I have noticed 'popping' and 'cracking' coming from
> the set.  Sounds like what you would hear if there was a lightning strike
> nearby, or if there was an internal component that aws arcing.
>
> As a result the radio does not receive on any bands at the moment.  I took
> it out of its cabinet and checked/replugged all the connectors between
> modules.  I fired it up and it worked perfectly normal.  I turned it off,
> put it back in the cabinet and...same issue!  I removed it again and the
> issue persists.
>
> I don't even know where to start with this, and I am upset that my beloved
> R-390 seems to be dead in the water.
>
> any suggestions or thoughts?
>
> Thanks,
> -Alex
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