[R-390] Main Dial Tuning Friction

[Ed G]

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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