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 <[email protected]> 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 <[email protected]> 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 <[email protected]> >>>> 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 <[email protected]> >>>>>>> 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 >>>>>>>> [email protected]. >>>>>>>> To view this discussion on the web, visit >>>>>>>> https://groups.google.com/d/msgid/neonixie-l/f43249af-46d4-45a3-8dcc-275f0e4ad43en%40googlegroups.com >>>>>>>> >>>>>>>> <https://groups.google.com/d/msgid/neonixie-l/f43249af-46d4-45a3-8dcc-275f0e4ad43en%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>> . >>>>>>>> >>>>>>> -- >>>>> 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 >>>>> [email protected]. >>>>> >>>> To view this discussion on the web, visit >>>>> https://groups.google.com/d/msgid/neonixie-l/2787a2fd-4b5f-4a8e-aefd-cf26604798ffn%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/neonixie-l/2787a2fd-4b5f-4a8e-aefd-cf26604798ffn%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>> >> 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 [email protected]. >>> To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/43ffeafb-05f8-435b-8960-d70278d3746en%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/neonixie-l/43ffeafb-05f8-435b-8960-d70278d3746en%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > 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 > [email protected]. > > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/d0826c80-f5d1-429f-885a-b8c54cbd55b9n%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/d0826c80-f5d1-429f-885a-b8c54cbd55b9n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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