Ditto on the stranded copper wire. One of the most frustrating things and almost impossible to clean the strands well enough for the solder to wet and make a reliable connection.
Randy > On May 1, 2023, at 4:58 PM, gregebert <gregeb...@hotmail.com> wrote: > > Usually when I cant solder something it's because there is too much surface > oxidation. Some of it gets so bad that rosin-based flux wont dissolve it, so > the next step is to scrape it off with sandpaper, or a dremel tool. > > So far, the worst I've encountered are > Oxidized copper leads on bulk neon bulbs from China > Lugs on very old switches, pots, and lamp sockets that were not previously > soldered > Really old resistors that were never used.....from the 1950s and 1960s > Stranded copper wire that mysteriously corroded *beneath* the insulation. I > suspect there was a slow chemical reaction between the copper and something > that outgassed from the plastic insulation. > >> On Sunday, April 30, 2023 at 2:00:24 PM UTC-7 Paul Andrews wrote: >> Interesting. Maybe time to break the flux out? Works for me on old radios. >> >>>> On Apr 29, 2023, at 12:37 PM, Batareyka <batar...@gmail.com> wrote: >>>> >>> >> >>> >>> mth-90 used solder with a high lead content. Therefore, for a long time of >>> non-use, the balls on the legs of the solder oxidize and form a rather >>> large film of oxide that prevents the metal itself from melting. >>> To do this, you need to remove the plaque to a shiny with anything, a file >>> or a knife. >>> And after that, everything is soldered quite easily. >>> суббота, 29 апреля 2023 г. в 19:31:58 UTC+3, Jasper nagle: >>>> Maybe I have another go at the blobs tomorrow on a few different tubes >>>> I’ll see if age makes a difference >>>> >>>>> On Sun, 30 Apr 2023 at 12:23 am, Yohan Park <w...@kitsunegari.net> wrote: >>>>> Just tried with my iron set to the highest temperature (480C/896F), added >>>>> lead based solder to try to make it going but nothing happened. >>>>> So either you're soldering at insanely high temperatures or they've used >>>>> different materials over the years... :) >>>>> >>>>>> On Saturday, April 29, 2023 at 2:01:11 PM UTC+2 Jasper nagle wrote: >>>>>> I was able to melt the blobs on the mtx-90 with a soldering iron so it >>>>>> must be something like tin or lead >>>>>> >>>>>>> On Sat, 29 Apr 2023 at 7:56 pm, Yohan Park <w...@kitsunegari.net> wrote: >>>>>>> No that's not true. It's not solder but a different metal (can't recall >>>>>>> what it is) to make it easy to solder. You won't be able to melt the >>>>>>> blobs with your soldering iron though. >>>>>>> >>>>>>>> On Friday, March 24, 2023 at 1:10:31 PM UTC+1 Paul Andrews wrote: >>>>>>>> I had read that the little balls on the ends of the leads are solder. >>>>>>>> Is that not true? >>>>>>>> >>>>>>>>> On Friday, March 24, 2023 at 7:17:05 AM UTC-4 Jasper nagle wrote: >>>>>>>>> thanks for that >>>>>>>>> >>>>>>>>>> On Fri, Mar 24, 2023 at 7:01 PM Batareyka <batar...@gmail.com> wrote: >>>>>>>>>> H3PO4 >>>>>>>>>> or >>>>>>>>>> H3PO4 + HCl (10:1) >>>>>>>>>> >>>>>>>>>> пятница, 24 марта 2023 г. в 12:33:31 UTC+2, Jasper nagle: >>>>>>>>>>> tubes im having no luck putting tin to them i even managed to tin >>>>>>>>>>> the painted surface i was working on in the process >>>>>>>>>> >>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> You received this message because you are subscribed to a topic in >>>>>>>>>> the Google Groups "neonixie-l" group. >>>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>>> https://groups.google.com/d/topic/neonixie-l/nDLLgyjpV_I/unsubscribe. >>>>>>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>>>>>> neonixie-l+...@googlegroups.com. >>>>>>>>>> To view this discussion on the web, visit >>>>>>>>>> https://groups.google.com/d/msgid/neonixie-l/f43249af-46d4-45a3-8dcc-275f0e4ad43en%40googlegroups.com. >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to a topic in the >>>>>>> Google Groups "neonixie-l" group. >>>>>>> To unsubscribe from this topic, visit >>>>>>> https://groups.google.com/d/topic/neonixie-l/nDLLgyjpV_I/unsubscribe. >>>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>>> neonixie-l+...@googlegroups.com. >>>>>> >>>>>>> To view this discussion on the web, visit >>>>>>> https://groups.google.com/d/msgid/neonixie-l/2787a2fd-4b5f-4a8e-aefd-cf26604798ffn%40googlegroups.com. >>>>> >>>>> -- >>>> >>>>> You received this message because you are subscribed to the Google Groups >>>>> "neonixie-l" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send an >>>>> email to neonixie-l+...@googlegroups.com. >>>>> To view this discussion on the web, visit >>>>> https://groups.google.com/d/msgid/neonixie-l/43ffeafb-05f8-435b-8960-d70278d3746en%40googlegroups.com. >>> >>> -- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "neonixie-l" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/neonixie-l/nDLLgyjpV_I/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> neonixie-l+...@googlegroups.com. >> >>> To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/d0826c80-f5d1-429f-885a-b8c54cbd55b9n%40googlegroups.com. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neonixie-l+unsubscr...@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/c9f75756-bfa4-4835-8081-f661aacfa45an%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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