Son of a gun, after all the pedals, preamps, and tube amps (2 only) that I've built, it never occurred to me to zero the pot so that the resistive element doesn't be introduced the heat from the lugs. I imagine the wiper lug would be the most threatening. Now I wonder if I caused any damage that was at the heart of any longevity or adjusting issues. Such a worthy point. Thank you.
Great last "tip"...idle that solder tip! That's what I was instructed to do in the US NAVY Micro-Miniature repair school. I get several months out of a tip just by keeping it clean and tinned like that.
I learned the hard way when soldering pots. Always good to lightly sand or scuff the back of a pot to make soldering easier. The less heat and time spent on a pot is best.
Thank you always for sharing your wisdom and experience. I find your videos to be a great resource. When my piggy bank gets healthy, maybe I can splurge for one of your Dr. Walsh, Z-Master Outfits! Great Times Ahead. Thanks Dr. Z
I thought to myself "do I really need to be taught how to solder after all these years?" Well ... yes. The pot soldering makes total sense ... but I didn't think of it until Dr Z told me. Thanks Mike.
Sorry if I have some more tips to share. I've had 20 years experience soldering, taught by the Air Force, and on the bench repairing aircraft avionics components.
Keeping a bead of solder on your iron tip will help it last much longer, keeps it tinned and oxide-free so that more solder will flow the next time it's used. Clean the tip before use using a copper/brass wool ball (they make these specifically for solder stations), then tin with solder.
Flux! Flux is your friend! It will help deoxidize the surface of the component, as well as act as a catalyst to allow the solder to melt at a lower temperature. One may think it is too messy or gets everywhere. Just clean everything with isopropyl alcohol afterwards.
Solder bridge. When first flowing solder to bond components, place your solder wire in between the iron tip and component, creating a bridge of freshly melted solder. This will reduce the dwell time heating the component that can lead to damage. Then, continue feeding more solder wire at the point of contact as needed to fill any voids.
Always use an ESD strap from wrist to ground, especially when handling sensitive component (i.e., transistors, op amps, IC chips, capacitors, tubes).
I hope these tips can be helpful, and are taken as me wanting to be helpful and supportive. I love your videos and can't wait to watch more!
Dr. Z AMA: "Soldering Tips and Techniques"
Dr Z Amplification
17,012 views
Dr. Z shares some of the techniques he uses when soldering amps that are built to last a lifetime.