[R-390] Intermittent problem.

[David Wise]

My R-390A's intermittent deafness some years ago was a failing mica capacitor on one of the mechanical filters.  The cap was not sensitive to heat or vibration.  I isolated it to one bandwidth, i.e. switch contacts, wires, caps, and the filter itself.  After jiggling the wires and cleaning the switch did nothing, I replaced the caps in the hope it was not the filter.  Win!

Dave Wise
SWL in Hillsboro Oregon

-----Original Message-----
From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of k2cby
Sent: Thursday, June 26, 2014 1:11 PM
To: R-390 Mailman
Subject: [R-390] Intermittent problem.

Intermittent problems are the hardest of all to find (solve).

<snip good tutorial>