"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 ----------------------------------------------------------------------
