soldering with an acid flux is OK *IF* you clean ALL the flux off
afterwards. (very iffy...)

Otherwise,the acid eventually eats thru the wire enough that vibration
breaks it.

BTW,some rosin fluxes are more active than others.

I wonder if you first cleaned the wires with Tarn-X,then soldered with
rosin flux,if that would be better?

--
Jim Yanik
jyanik
at
kua.net



Capillary action will pull acid up the insulation when heated and down the
road the joint will fail.

46 years of soldering and still learning new "Tricks".