I still have my 20-year-old 2 oz bottle of Cramolin (the precursor to deoxit) and it's 3/4 full :)
A toothpick works for switch contacts. I do use a Q-tip on the tube pins when needed. Steve, W1ES/4 -----Original Message----- >From: Dennis Monticelli <[email protected]> >Sent: Mar 5, 2012 11:52 PM >To: Richard Knoppow <[email protected]> >Cc: [email protected], m coffey <[email protected]> >Subject: Re: [Drakelist] Trouble with TR4 ? > >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 _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
