"Dennis Monticelli" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- 100% DeOxit on business card stock has worked well for me cleaning relay contacts. Put a little extra pressure on the contacts as you swipe the card back and forth. Before I discovered DeOxit I used 600 grit sandpaper which does remove material so don't try it on plated base metal.
Dennis AE6C On Jan 13, 2008 8:46 PM, Jim F. <[EMAIL PROTECTED]> wrote: > > "Jim F." <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > > I found one of these tools on eBay to use on the > relays in my Swan boatanchor. I used one at Western > Electric > many years ago and it was designed to burnish relay > contacts. WECO used to use millions of relays. > > Western Electric 265C Burnisher Pocket Tool > ( eBay #270184548836) > > 73 > > Jim > > > > --- Mark Pilant <[EMAIL PROTECTED]> wrote: > > > > > Mark Pilant <[EMAIL PROTECTED]> made an > > utterance to the drakelist gang > > > ---------------------------------------------------------------------- > > Greetings all. > > > > I have managed to find some time to work on my TR-3 > > and have > > made a fair amount of progress. > > > > The first step was to clean off most of the grime, > > dust, etc. > > with Q-tips and (isopropyl) alcohol. Followed by > > DeoxIT on the > > various switch contacts, tube socket contacts, and > > T/R relay. > > > > BTW, I discovered the blue coloring on the blue > > filter can be > > removed with the alcohol. Fortunately, the bluing > > was on the > > white backing no the actual blue filter. Be > > careful. > > > > After that came doing all resistance checks. > > Anything more > > than 10% off the table in the manual I investigated. > > I found > > two very curious things. First, pin 7 (6AU6A - VFO > > cathode) is > > shown as 7 ohms in the table, but my meter (Fluke > > 875 with needle > > probes) showed it as open. The original manual I > > have (from a > > different owner) also shows this. I'm not sure if > > this is OK. > > I'm not sure I really want to pull the PTO to trace > > the circuit. > > > > Second, the first time through, the cathode and grid > > resistance > > measurements of several tubes were vastly different > > (in both > > directions: high and low). Looking into this > > further, the tubes > > all appeared to be in the receive chain. On a > > hunch, I played > > around a but with the T/R relay contacts while > > measuring the > > cathode resistance of V12 (IF amp). It would go > > from 105 ohms > > to 29.7K. What was curious was it wasn't up and > > down motion of > > the relay contact but side to side. > > > > > > So it looks like my T/R relay needs some serious > > attention. I > > can think of a several of things to try: > > > > 1) Clean it again with DeoxIT (by pulling > > soaked heavy > > paper through the contacts). > > 2) Use a burnisher or very fine grit (1000+) > > wet/dry > > sandpaper. (Like Mark Gilger's "Relay > > Care" Tech Tip > > on WB4FHN's site.) > > 3) Find a replacement relay. I'm not sure if > > this is > > possible. > > > > Since my TR-3 has an open frame T/R relay, it isn't > > too surprising > > it is dirty. I'm just not sure if I will be able to > > adequately > > clean the contacts. I'm preparing myself to have to > > remove the > > relay to really clean it. I'll also check the > > armature string > > tension as well. > > > > All comments and suggestions welcome. > > > > 73 > > > > - Mark N1VQW > > > > > ---------------------------------------------------------------------- > > Submissions: [EMAIL PROTECTED] > > Unsubscribe: [EMAIL PROTECTED] - > > unsubscribe drakelist in body > > Hopelessly Lost: [EMAIL PROTECTED] - help in > > body of message > > Zerobeat Web Page: www.zerobeat.net - sponsored by > > www.tlchost.net > > > ---------------------------------------------------------------------- > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
