Bob, you should use Simple Green 50/50 water to do the cleaning. It just runs off. -73- Peter K2LRC www.k2lrc.com ________________________________________ From: [EMAIL PROTECTED] [EMAIL PROTECTED] On Behalf Of Bob Bruno - K2KI [EMAIL PROTECTED] Sent: Tuesday, March 11, 2008 6:52 PM To: [email protected] Subject: [AMRadio] Progress report on my DX-100
Hi all, I just thought I would share what I have been doing to the DX-100 transmitter that I got the other day. The whole radio looks like it was dipped in a nicotine vat and left to sit. First, I removed the chassis from the enclosure which BTW does not have any holes drilled in it but it too was brown and sticky. I noticed right off that the 6AU6 VFO tube was cracked and was white inside. I then tested all of the tubes and found the 5763 Driver tube had an open filament. The 12BY7 Xtal Oscillator tube was also bad. My tube tester (B&K Dynajet 606) does not test 1625's. I have 21 NOS and 5 used but working 1625's so I can replace both without breaking a sweat :-)... I then inspected the topside of the chassis. There are numerous places where the chassis is rusted. It looks like something dripped down into the rig. Other than that, a good cleaning will make it shiny-new. The Final tank will need some attention but not too much. I then inspected the underside of the beast. It looks just like the day it come out of the box. All shiny and new. There are a few bad solder connections and the caps need to be replaced. The .1 MFD 600V cap has a crack running from one end to the other. The Power Xfrmr was clipped out of the circuit and reconnected. I would say that it probably died and was replaced with a Xfrmr from a donor. Other than the above, all looks extremely promising. Now to the fun part... The front panel... I first removed all of the knobs and felt sick just holding them. All of them were caked with hardened hand oils and nicotine. I couldn't even scrape them clean. So, I soaked them for about 3 hours in a hot soapy water mixture with some vinegar mixed in. After I scrubbed them with a toothbrush, they came absolutely clean. Oops. I think I used the XYL's toothbrush. Shh don't tell her :-) While the knobs were soaking, I had at the front panel. The paper towel that I used for the first pass was brown and stank. It took me 3 hours to completely clean and degunk the panel. After reinstalling the knobs, I stepped back and realized that I actually made progress. Seeing that thing turn from a brown box-shaped turdlet to a shiny vintage xmitter, made me feel better about the whole project. Next installment will be the chassis cleaning and capacitor replacement. I took pics along the way. I posted them on my Photo Bucket acct. Here is the link: http://s261.photobucket.com/albums/ii71/k2ki/DX-100/ Until next time... 73, cul... Bob de k2ki ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
