Including that bit of silver solder with the older Tek gear just spoke of their commitment to quality and long service life!! I had several older pieces of Tek gear and remember well the schematics with voltages listed and a functional description of every part in them. Many of my Tek units had that silver solder included, I know my anniversary edition 453 had it. Once Tek got sold into 'Megagihugic' corporate anonymity where profit before anything else was key the quality slipped, prices went stratospheric, parts became obsolete before the warranty ran out, they incorporated Microshit operating systems which when crashed handed you a $100,000 brick that the factory would repair for $15,000 and active probes began to cost as much as a used Lexus. Loved the old Tek, curse their new stuff.