Look at the back of the connector.
The pins may be held in with a small clip.
If so you can replace the bad pin from a donor without changing the
entire connector.
73
Glenn
WB4UIV
On 6/12/2026 1:52 PM, n4buq via R-390 wrote:
Here’s a picture.
Thanks,
Barry
On Jun 12, 2026, at 12:48 PM, Barry via R-390<[email protected]> wrote:
I have a 20-pin female connector that I believe was for an R390A. I presume
that's the same as for the R390 but I don't know that for sure. Unfortunately,
I don't have the male chassis mount part.
Let me know if you think you can use it.
73,
Barry - N4BUQ
Everything has been going well on restoring my R-390, until I noticed no AGC
voltage. Then I unplugged the 20-pin connector. Lo and behold, pin 15 had
corroded right off (the AGC line)! The mating plug has severe pitting and a
thick black oxide replaced what was once gold plating. But underneath,
everything is pristine. I am going to have to replace the pair.
A parts radio might yield them. I would happily buy them. An extender cable
would have this pair.
Interestingly, the Antenna Box BNC jacks were destroyed by pitting, but I
re-built that without thinking beyond it. This reminded my of the circuit
breakers in a plant that made sulfuric acid. Not only did the breakers fail
every few months, but the panels would grow long silver whiskers. So there
was something in the environment of that radio... ?
Thank you,
WN9i Fred
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--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: [email protected] AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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