Dale, I don't know what is the root of your R-4A problem but from your discription I doubt it was unevaporated DeOxit. One thing DeOxit cannot fix is wafer switches that are no longer in good alignment or where the wipers have lost their pressure contact.. DeOxit takes care of surface oxides, but not mechanical issues.
Dennis AE6C On 12/24/11, kb8bku <[email protected]> wrote: > Dale, > > I had a somewhat similar experience. I hadn't written, as I was reluctant > to badmouth the De-oxit, as that seems to be the cleaner/lubricant of choice > with the Drake crowd. I just figured it must be something else, and it > probably is. I got some of the tiny pink $3 tubes (D-100L) at hamvention to > see what all the crowing was about. My R-4A would cut-out on 40 > intermitantly, but rocking the bandswitch would restore operation. It had > been ~5 years since I had cleaned and lubed it with Blue Shower cleaner and > lubed with Blue Stuff for tuners. I very carefully cleaned the bandswitch > with Q-tips and alcohol, then lubed very sparing with De-Oxit on a Q-tip. I > was very careful to avoid leaving cotton fibers in the switch mechanism. > When I powered up the next day I had lost sensitivity according to the > S-meter (signals from antenna as well as calibrator were reduced from S9 or > ten over 9 to S5-S7). I checked for lose tubes, etc., but found no cause. > I rechecked the sensitivity adjustment, but no soap. > > I had begun experiencing audio hum, so while I had the radio opened, I > re-caped the three sections of the electrolytic can at the same time as I > cleaned the bandswitch. The hum do go away, and I looked for any big DC > changes (due to the re-cap) that might throw things off, but didn't see > that. > > I have been unable to conclude that I have AGC problems, which is what I > might first expect. One good thing, my 40mtr xtal osc. circuit works > better than ever. It has always been iffy, and I usually used the FS-4 when > I was on 40 for that reason. > > I will let you know if I figure anything out. Suggestions welcome, although > I realize this isn't much to go on. My first second, and third assumptions > were that I disturbed something to cause my problem. This is my first > experience with De-Oxit. I am quite experienced with these types of radio > repair. I've tried to imagine what I disturbed and check that, but to no > avail so far. > > Working at a relaxed pace, > > KB8BKU, Darryl in Dayton > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
