Joseph, The only place where I have seen low thermal solder used was in the OLD TEK tube scopes in only one special place. Those OLD tube scopes had a few ceramic standoffs that had a number of cupped spaces with metal surfaces bonded with some kind of glue that could not take a lot of heat. These standoffs were used, at the time, for providing a high impedance, low leakage connection point. We are talking in the 1950 and 1960's time frame. Later in time TEFLON became the choice for such use. Bill....WB6BNQ Joseph Gray wrote: >Volker, > >I came across a couple of old Fluke differential voltmeters that need some >work. I thought it would be best to use low thermal EMF solder on these. > >Joe Gray >W5JG > > > >On Mon, Aug 12, 2013 at 10:39 AM, Volker Esper <ailer2@t-online.de> wrote: > > > >>Sorry, Joe, if my question was mistakable. I wanted to know your >>application. Maybe I'd recommend not using a special solder alloy rather >>than going the long way of aquiring it. >> >>I give you an example: When fixing a 6.5 digit DMM (HP34401A) I wasn't >>sure if I might use a special alloy to solder the pins of an input relay. >>In the end I did not. Comparing this fixed unit to a second one in several >>automated 24 hours tests with varying room temperatures, there seem to be >>no measurable differences between the two. So in this case it appears to be >>of no great importance using a special solder. >> >>Enthough the thermoelectric voltages at these pins are not negligible and >>therefore have to be considered, other effects obviously are of much more >>effect. So, as I mentioned, using a special soldering alloy drops in the >>priority list. >> >>Now, that I'm curious, please let us know, what you are using the solder >>for. >> >>Volker >>DF9PL >> >> >>Am 12.08.2013 15:06, schrieb Joseph Gray: >> >> >> >>>As I asked in my original message, I'm trying to find out where I can buy >>>a >>>small quantity of rosin-core 10/90 (tin/lead) solder. I don't want to buy >>>it in bar form from China. >>> >>>Joe Gray >>>W5JG >>> >>> >>> >>>On Mon, Aug 12, 2013 at 3:17 AM, Volker Esper<ailer2@t-online.de> wrote: >>> >>> >>> >>> >>> >>>>sorry, spelling mistake: >>>>"What do you _want_ it for?" >>>> >>>>Remember, those solder alloys are optimized for a specific alloy >>>>combination only, e.g. Cu-Cu. >>>> >>>>Volker >>>> >>>> >>>>Am 12.08.2013 10:39, schrieb Volker Esper: >>>> >>>> >>>> >>>> >>>> >>>> >>>>>Hi Joe, >>>>> >>>>>What are you looking for, Cadmium-Solder, or Sn10Pb90, which is >>>>>Stannum/Plumbum-only? >>>>> >>>>>And what do you what it for? In (very high) precision applications there >>>>>are so many issues to consider that the solder doesn't appear to be at a >>>>>high priority... >>>>> >>>>>Volker >>>>> >>>>> >>>>>Am 12.08.2013 00:38, schrieb Joseph Gray: >>>>> >>>>> >>>>> >>>>> >>>>> >>>>>>Reading through the archives, I saw that there was some discussion >>>>>>about >>>>>>a >>>>>>safer alternative to cadmium-based solder. The low tin, high lead alloy >>>>>>was >>>>>>recommended as a good low-thermal EMF substitute. However, I did not >>>>>>see >>>>>>any recommendations on where to buy some of this. >>>>>> >>>>>>I just did some searching and all I come up with is bar solder, mostly >>>>>>from >>>>>>China. Where can I buy a small quantity of rosin-core 10/90 solder? >>>>>>Mouser, >>>>>>which is my preferred vendor certainly didn't list any. I would think >>>>>>that >>>>>>even 1/2 pound would last me a lifetime. >>>>>> >>>>>>Joe Gray >>>>>>W5JG >>>>>>______________________________****_________________ >>>>>> >>>>>>volt-nuts mailing list -- volt-nuts@febo.com >>>>>>To unsubscribe, go to https://www.febo.com/cgi-bin/****<https://www.febo.com/cgi-bin/**> >>>>>>mailman/listinfo/volt-nuts<htt**ps://www.febo.com/cgi-bin/** >>>>>>mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >>>>>> >>>>>> >>>>>>and follow the instructions there. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>______________________________****_________________ >>>>> >>>>>volt-nuts mailing list -- volt-nuts@febo.com >>>>>To unsubscribe, go to https://www.febo.com/cgi-bin/****<https://www.febo.com/cgi-bin/**> >>>>>mailman/listinfo/volt-nuts<htt**ps://www.febo.com/cgi-bin/** >>>>>mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >>>>> >>>>> >>>>>and follow the instructions there. >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>______________________________****_________________ >>>> >>>>volt-nuts mailing list -- volt-nuts@febo.com >>>>To unsubscribe, go to https://www.febo.com/cgi-bin/****<https://www.febo.com/cgi-bin/**> >>>>mailman/listinfo/volt-nuts<htt**ps://www.febo.com/cgi-bin/** >>>>mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >>>> >>>> >>>>and follow the instructions there. >>>> >>>> >>>> >>>> >>>> >>>> >>>______________________________**_________________ >>>volt-nuts mailing list -- volt-nuts@febo.com >>>To unsubscribe, go to https://www.febo.com/cgi-bin/** >>>mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >>>and follow the instructions there. >>> >>> >>> >>> >>> >>> >>______________________________**_________________ >>volt-nuts mailing list -- volt-nuts@febo.com >>To unsubscribe, go to https://www.febo.com/cgi-bin/** >>mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >>and follow the instructions there. >> >> >> >> >_______________________________________________ >volt-nuts mailing list -- volt-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >and follow the instructions there. > > >