FYI. After the DeOxit treatment I usually follow with ProGold. The latter is a preservative for precious metal surfaces, but also leaves a lubricating film. If the switch contact plating is worn through or lightly touching, I can see where leaving some lubrication behind may help. After DeOxit dries there isn't much lubricating action.
As with DeOxit, use it sparingly. In fact, it takes even less ProGold to do the job. My tiny costly bottle will probably last a lifetime. Dennis AE6C On 3/5/12, Richard Knoppow <[email protected]> wrote: > > ----- Original Message ----- > From: "m coffey" <[email protected]> > To: <[email protected]> > Sent: Monday, March 05, 2012 4:16 PM > Subject: [Drakelist] Trouble with TR4 ? > > >> First, I would like to thanks those who p osted info >> on whitening >> pointer knobs and the TR4 tube shields. >> >> Now, after having cleaned the switches and >> cleaned/reseated all the >> tubes, etc., I am trying out receive side on the radio >> with a 75ft. random >> wire. 20 and 80 have signals, but thats about it. Fairly >> low volume and no >> movement on the S meter ( S meter zero works fine). Also >> when switching >> between 20, 40, 80M, the sideband switches everytime and I >> have to correct >> it with the sideband switch ( normal?). When the >> calibratetor is used, I >> have it fine on 80 and 20 (with a constant low tone in >> background) but not >> on 40. Also no indication of calibrate on S meter. I got >> spare tubes with >> the radio (boxed but unchecked) and went through and >> subbed all the tubes >> in the receive line one by one, no change. >> Thoughts, suggestions? Mike. >> > I found the some positions of the bandswitch on my TR-4 > were persistently intermittant. I would clean them with > Deoxit and work them and all would be fine. Then, the next > day all 10 meter bands were dead. I finally cleanded the > switch and coated it lightly with Tuner-Lub. That resulted > in a pretty much permanent fix. I am not sure what happens > to these switches but suspect the pressure of the contacts > against the sliding part becomes weak. Rotary switches are > _supposed_ to be self cleaning because of the sliding > action. I suppose it works better if switches are > constantly in use. I had a similar thing in an SP-600-JX > where the IF bandwidth switch became intermittant. Cleaned > several times with Deoxit but it became noisy and > intermittant again in a few days. Here again Tuner-Lub seems > to have given a long term fix. Of course, there may be > other problems with the TR-4 but I suggest that even if you > have gone through and worked the screws and cleaned the > switches to do it again. Its simple and might fix the > problem. > > Its also possible that the thing is way out of > alignment. If the above voodoo doesn't fix it I suggest > going through the alignment procedure. > > Its normal for the side band indicator to switch with > the band. Its set up for the most commonly used sideband on > each band. > > > > > -- > Richard Knoppow > Los Angeles > WB6KBL > [email protected] > > > > > > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
