Looking back at the archive I downloaded from the #birdsite, I found some fun pictures. Those are from 2016, when I got a #Tektronix 576 curve tracer. It was designed to be #repaired! It even sported a roll of special soldering wire for the repairs. I love the notice "IT IS DESIRABLE THAT ONLY SILVER-BEARING SOLDER BE USED ON THE CERAMIC TERMINALS AND FOR THINNING THE IRON. ORDINARY TIN-LEAD SOLDER MAY BE USED BUT REPEATED USE WILL BREAK THE SOLDER TO CERAMIC BOND. SEE YOUR INSTRUCTION MANUAL"