A couple years ago I inherited a reading lamp my Grandfather gave my Grandmother back in the 40s. It was functional, except the 3-way rotary switch needed to be replaced. The new switch had copper strand wiring, whereas the lamp's wiring was aluminum strand. Now I'm hearing it's not advisable to mate copper to aluminum. Too late, I already did. Using butt connectors. Am I in for problems?
I doubt it was aluminum wiring , in fact silver or tinned copper is more likely for fixture wire , butt connectors would work ok for either of the 2. If aluminum corrosion may have already started. I would check for signs of thermal stress at the connectors. I actually have run into silver several times because silver was available at times when copper was not but including solid silver buss bars . I have never seen aluminum fixture wire. Note tinned copper looks just like aluminum but aluminum is brittle and just a bend or 2 it starts cracking and breaks. But I doubt it is aluminum.