View Full Version : Soldering iron equipment


Marco Leavitt
September 7th, 2014, 01:58 PM
So I've decided to finally tackle the pile of dead XLR cords I have accumulated over the years by re-terminating all of them. Can anyone recommend what equipment I need to get started? Is there a point to buying the more expensive variable temperature soldering irons? I haven't held a soldering iron since middle school.

Rick Reineke
September 7th, 2014, 03:52 PM
I prefer a multi or variable temperature soldering station, however for XLR and 1/4 connectors only, a 30W pencil/iron would work.; Other tools one would want on-hand, wire strippers, razor blades, small side-cut nippers, needle-nose and other assorted small pliers, a de-soldering tool/pump. A 'helping hands' type tool/clamp/holder and is a must-have IMO. I couldn't live w/o shrink tubing either, especially with smaller connections.

Bruce Dempsey
September 7th, 2014, 06:21 PM
and don't forget the patience waiting for old tarnished wires to heat up lol

Greg Miller
September 7th, 2014, 06:21 PM
I agree wholeheartedly with everything Rick said, especially the variable-temp soldering station. If buying a conventional iron, I might be inclined to go slightly higher than 30 watts, IMHO that's borderline in some cases. You need to get the connection and solder hot fast. If you heat it slowly and you're waiting 30 seconds for the solder to melt, you have a good chance of damaging some insulation.

If you don't want to invest in a de-soldering station, one of the fluxed wick products (names like Solder-Wick) will be adequate.

And if you do start using heat shrink, you should have a heat gun at well. Doing it with flame is not really civilized.

Marco Leavitt
September 8th, 2014, 07:58 AM
Thanks everyone. Are brand names important to any of this? Is there anything I should avoid when putting all this together?

Rick Reineke
September 8th, 2014, 09:05 AM
Generally, 'you get what you pay for'. Weller, ect. But like audio gear, experience & skills have a lot to do with it. I can't count how many times I've forgotten to put the connector barrel, insulator and heat shrink on prior to soldering the connections.

Yes indeed Greg, a heat gun would definably be wanted. I've previously toasted my share of connections and cable with a matches, lighters and stoves. A lower cost heat gun should surface in this job though.
FWIW, Harbor Freight tools frequently has coupons for a dual temp. heat gun for around $10.

Greg Miller
September 8th, 2014, 08:44 PM
I can't count how many times I've forgotten to put the connector barrel, insulator and heat shrink on prior to soldering the connections.

Yeah, that's especially fun if you've just finished soldering a PL-256 RF connector. :-(

Seth Bloombaum
September 9th, 2014, 10:37 PM
I like the Paladin solder pump for removing the old stuff. Solder wick is handy too, but I use the Paladin a LOT.

A cheap "helping hands" with a couple of alligator clips for positioning leads.

A few years ago I came across a used panovise, great for positioning connectors, but expensive when new.

Reading glasses. Good light.

A small fan you already have to blow the fumes away from the work (and you).

GOOD solder.

If you get an iron instead of a station, be sure to buy some of the sponge material (that comes on a station). You get it wet, wring it out, and it can really clean off that iron.

I used to use a small file to dress the soldering tip smoothly, but modern tips don't pit the way they used to.

SMALL diagonal cutters, needlenose pliers, and hemostats. Medium diagonal cutters. A good wire stripper, though with practice you can use the cutters. These good hand tools really make a difference.

A "spudger", a little tool that just pushes wires around, hot or not.

An assortment of GOOD shrink wrap, in clear and black.

A labeler.

A cheap heat gun.

Always tin leads before soldering. Always start with a clean iron, then a glob of fresh solder on it to conduct the heat from the iron to the work.

I use all this stuff and more - with the exception of the panovise and solder pump, the latest cheap imports at harbor freight actually work quite well.

Solder and shrink better come from the electronics store...

Richard Crowley
September 9th, 2014, 11:01 PM
An excelent three-part video series from David Jones on soldering:
EEVblog #180 - Soldering Tutorial Part 1 - Tools EEVblog #180 - Soldering Tutorial Part 1 - Tools - YouTube
EEVblog #183 - Soldering Tutorial Part 2 EEVblog #183 - Soldering Tutorial Part 2 - YouTube
EEVblog #186 - Soldering Tutorial Part 3 - Surface Mount EEVblog #186 - Soldering Tutorial Part 3 - Surface Mount - YouTube

Rick Reineke
September 10th, 2014, 09:02 AM
Another item I forgot to mention.. Seth is absolutely correct in recommending a 'small file set'. for rounding off sharp edges the can poke through isolators and shrink tubing.. and cause a short... and naturally this would occur at the worst possible moment.

Bruce Dempsey
September 10th, 2014, 01:02 PM
what do you fellas think of the gas jobbies strictly for joining twisted copper wire?
I have both a 40w iron and a 100/140w gun and find the heat time too long as a rule but maybe is dirt on the wires or something.
Another question if I may and apologies to the OP for butting in his thread: What if the wire is tarnished, do you dip it in a bit of soldering paste first?
tks

Greg Miller
September 10th, 2014, 04:23 PM
I don't file the tips if I can possibly avoid it. Some tips are plated and once you get through the plating down to the base metal, then the tip will corrode and pit.

Not sure what Mr. Dempsey means by "gas jobbies." Hopefully he does not mean a propane torch ... that's for plumbing, and much too hot for wiring.

Start with a clean tip, turn on the heat, put a dab of fresh solder on the tip. After the solder melts, put the tip w/ solder against the wires, and the solder will conduct the heat to the wires. Press some more fresh solder against the wires, it should melt within a few seconds ... certainly less than 30 seconds with 100 watts. (Mr. Bloombaum has also described this, above. Pre-tinning the leads is also often helpful.)

Electronic solder contains a flux core, so you should not need more. Don't use "solder paste," that is acid-based, again for plumbing work. It will ultimately corrode the wires and ruin the connection. Only with very old and corroded wires will you benefit from additional flux. If you do feel the need, be sure you get a good liquid flux in a bottle, and brush it on sparingly. If you end up with a big surplus of flux when the joint is finished, it's better to clean it off (different flux needs different solvent).

Seth Bloombaum
September 10th, 2014, 09:37 PM
what do you fellas think of the gas jobbies strictly for joining twisted copper wire?
I have both a 40w iron and a 100/140w gun and find the heat time too long as a rule but maybe is dirt on the wires or something.
Another question if I may and apologies to the OP for butting in his thread: What if the wire is tarnished, do you dip it in a bit of soldering paste first?
tks
If the wire is tarnished, I'd cut off all the exposed copper and start over, stripping insulation to expose fresh copper. If that's tarnished too, throw it away and get new wire!

"Gas jobbies"... an iron that runs off a little teeny propane cylinder, the whole thing about the size of a carrot? A friend had one, they get darn hot. Too hot for typical signal connectors.

Gotta' ask, what are you soldering that a gun won't melt solder in a couple seconds? If you're doing 12ga. wire and bigger, for power supply, then you will need more wattage. But those connectors are typically screw or crimp, not solder.

For common signal applications, we're talking 20 to 24ga, and your gun ought to work fine or maybe be too hot at the 100w setting. If it doesn't, you do need to look at your technique, as several have mentioned. Tin, clean the tip, use a glob of solder to transfer heat from the tip to the work (this is very important).

I'm a little out of my depth with wattage for an iron; it used to be common, but now electronics irons or iron tips are rated in degrees. I suppose you could have big watts at low heat. 700 and 750 are common temps, sometimes 800 for big connectors. A small tip for small work, a big tip for big work - this relates to how much heating capacity the tip has.

The problem with heating wire or a connector for 20 seconds or more is that in that time the heat will be conducted to the insulation or the plastic structure of a plug/jack, and yes, the material will melt. It's a fine balance of time and temperature. Somebody mentioned melting insulation above, this is a real problem with bad technique or equipment.

I can't believe none of us have mentioned creating a mechanical connection! That means, you don't want the solder joint to be stressed in use, by plugging and unplugging for example. Maybe it's in the youtube videos above, I haven't looked at them. With Neutrik-style XLR connectors, or when you're wiring within a chassis, you've got strain relief. But for other connectors and some chassis joints you need to bend the wire around the terminal before soldering for a good, long-term joint. It doesn't take much, just tin, then form a U in the end of the wire (tiny U), hook the U on the connector, and crimp it together with the needlenose pliers. Then solder.

Seth Bloombaum
September 10th, 2014, 09:55 PM
An excelent three-part video series from David Jones on soldering:
EEVblog #180 - Soldering Tutorial Part 1 - Tools... Part 2... Part 3
Ack, an hour and 44 minutes on soldering with a perky aussie! Probably excellent, but I couldn't get past the fifth minute.

Perhaps there's an excellent 10 minute tutorial out there on the basics for audio connectors?

Speaking of the basics, what do you do when you're trying to figure out how to wire a 1/4" tip-ring-sleeve (aka stereo phone) connector to an XLR-male? I always go to this Rane Technical Note #110 (http://www.rane.com/note110.html). At the bottom there's a link to download it as a pdf. There are some differing opinions about grounding out there, but Rane's approach is respected, too, and the connector wiring diagrams at the bottom are very solid.

PS. I misnamed the handy Panavise above in the thread. Panavise, not panovise. The 301 is not really that expensive at your favorite online retailer. You don't need a vacuum base for soldering audio connectors...

Mark Watson
September 10th, 2014, 11:02 PM
So I've decided to finally tackle the pile of dead XLR cords I have accumulated over the years by re-terminating all of them. Can anyone recommend what equipment I need to get started? Is there a point to buying the more expensive variable temperature soldering irons? I haven't held a soldering iron since middle school.

If money were no object, I prefer Snap-On brand, especially for the side-cutters and files. They have a cordless (butane) soldering tool which can also perform the heat-shrinking task. Will only set you back $185.00. Good quality side-cutters really make a difference though.

Mark

Greg Miller
September 11th, 2014, 07:07 AM
I didn't realize Snap-on made small electronic tools. I think of them as something my mechanic uses to work on my vehicles.

Here in the states, Xcelite and Klein are very good brands for electronic tools. Craftsman (sold by Sears) used to have a lifetime warranty on hand tools, but I don't know if that still applies. Weller for soldering equipment. Kester for solder. Eutectic point solder (63/37) has the lowest possible melting point for a tin/lead combination, this is good for electronic work since the lower temperature is less likely to damage insulation and connectors. (60/40 performs significantly the same.)

Jon Fairhurst
September 11th, 2014, 01:11 PM
I don't file the tips if I can possibly avoid it. Some tips are plated and once you get through the plating down to the base metal, then the tip will corrode and pit.

Agreed! Leave the tip plated with solder as the protective layer.

Start with a clean tip, turn on the heat,

Insert...
* Let it heat up.
* Wipe tip on wet sponge to remove corrosion, and then...

put a dab of fresh solder on the tip. After the solder melts, put the tip w/ solder against the wires, and the solder will conduct the heat to the wires...

Also, I agree that no additional flux is required. I never use the stuff. Good solder already includes flux.

After each application, tap the iron on a hard surface to remove excess solder. Wipe the iron on a wet sponge to remove excess flux, corrosion, and any melted plastic that might have gotten on the tip. Re-tin the tip, if necessary and repeat the tapping and wiping. Next, you can add another dab to solder a new connection or turn the iron off with the tip tinned and clean.

If necessary, you can flood a hot tip with solder to help clean it (with the additional, included flux). Good heat transfer is all about having the tip-solder-wire connection direct and clean.

Richard Crowley
September 11th, 2014, 01:59 PM
Most modern tips are iron-plated and are ruined by filing or sanding.
Some people even claim that sharp-edge brass filings "sponge" things will harm the plating.
Aven 17530-TC Soft Coiled Brass Tip Cleaner: Amazon.com: Industrial & Scientific (http://www.amazon.com/Aven-17530-TC-Coiled-Brass-Cleaner/dp/B00LTKUPD2)

IME, it is better to leave the tip "dirty" in between uses (including powering down).
The extra solder layer on the tip protects it between uses.

Then simply clean it off with a damp sponge just before you use it.
I have even used wet paper towel in a pinch out in the wild.

And I have found it indispensible to put a tiny dab of new solder on the tip just to ensure a good heat transfer to whatever you are soldering.

Jon Fairhurst
September 11th, 2014, 03:30 PM
In my case, I clean the tip with the wet sponge, but I leave a good layer of clean solder on. And I never, ever file it. I've owned my Weller iron for nearly 30 years. Sometimes I use it a bunch. (I recently replaced all the wires in my Daughter's guitar - the Epiphone WildKat uses crummy high capacitance wires that eat treble.) and at other times it might sit idle for a couple of years. I still use the original tip and it still works like new. Yeah, the overall kit is a bit ugly after all these years, but as long as you get a clean, solid tin on the tip, you're good to go. :)

Greg Miller
September 11th, 2014, 04:52 PM
I have even used wet paper towel in a pinch out in the wild.

That wasn't "the wild." In the wild, I wipe it on my jeans.