Tektronix in the late 1970s and early 1980s produced in-depth training videos to teach employees how to solder the Tek way, emphasizing practical aspects of making solid solder joints on PCBs with through-hole components. The first video covers soldering chemistry, eutectic alloys, and proper use of silver-bearing solders. Unexpectedly, it reveals that cleaning a tip on a wet sponge is effective due to the sudden temperature change. The second video focuses on repair-specific topics like desoldering techniques and PCB damage prevention. Emphasis is placed on making repairs look good, especially with bodge wires placed discreetly on the back of the board.
https://hackaday.com/2025/01/09/retrotechtacular-soldering-the-tek-way/