[R-390] Main Dial Tuning Friction

[Francesco Ledda]

It may be a misalignment of be the brass guide on the front panel behind the main tuning knob.  This is somewhat movable and needs to be properly aligned. Its purpose is to avoid bending the tuning shafts.

Best, Francesco K5URG

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of Ed G
Sent: Monday, February 25, 2019 5:34 PM
To: r-390 at mailman.qth.net
Subject: [R-390] Main Dial Tuning Friction

HI Folks,
     Been following this list for many years, and appreciate the wisdom here. I have a Capehart R-390A in great shape. It works well and has no problems except that the main tuning dial (the �Kilocycle Change� dial) is somewhat tight�not excessively so, but a bit hard to turn.  I have cleaned the tuning mechanisms, and used Teflon grease in a few spots and synthetic oil sparingly on the gears.  Because the receiver is working so well I am hesitant to disassemble anything too far.
     I�ve read lots of R-390 material over the years, but don�t recall seeing much about a recommended way to approach gear train friction so that one ends up with the smooth, almost effortless tuning �feel� I have experienced on other R-390As (other than a total disassembly/rebuild).
     Perhaps there are certain problem areas in the mechanism that tend increase tuning resistance over time? Something I could address without a complete tuning module disassembly? Any recommendations would be appreciated.  
--Ed�


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