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 Post subject: Soldering Question
PostPosted: Feb Wed 28, 2018 9:09 pm 
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Joined: May Fri 06, 2016 3:41 am
Posts: 323
Location: Johnstown, Ohio
From time to time I get an AA5 that has had the loop antenna cut out of it, but present in the chassis. Most times when I have repaired the radio and wish to re-attach the loop I find it very hard to get a good solder joint. I have sanded clean the copper wires to remove dirt and what I think is shellac but it still does not want to take solder. Other copper I have run across easily takes the solder. Am I doing something wrong or should I be doing something else?
Regards,
Don


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 Post subject: Re: Soldering Question
PostPosted: Feb Wed 28, 2018 9:11 pm 
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Location: 42001 KY
I have found that if I dip my hot solder iron tip in my bucket of paste flux then solder it will take it better,.

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 Post subject: Re: Soldering Question
PostPosted: Feb Wed 28, 2018 9:19 pm 
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simplex1040 wrote:
I have found that if I dip my hot solder iron tip in my bucket of paste flux then solder it will take it better,.


Agreed. You might also melt a bit of flux in the bucket and dip the wire in the liquid flux prior to heating and applying solder to the wire.

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 Post subject: Re: Soldering Question
PostPosted: Feb Wed 28, 2018 9:44 pm 
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Location: Spring Hill, FL
You might not be getting all of the varnish off of the wire. If you can get the ends of the wire far enough away from the baking, use a lighter on the ends of the wire, about 1/2 inch or so. It will burn off the varnish coating in short order. Then just wipe the wire with a paper towel to get rid of the ash.

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Last edited by TPAairman on Mar Thu 01, 2018 7:48 am, edited 1 time in total.

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 Post subject: Re: Soldering Question
PostPosted: Feb Wed 28, 2018 10:16 pm 
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A method I use to tin stubborn small diameter wire strands is to put them on a small metal tray, use a razor blade, held at an angle, and gently scrape several times. Always works.

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 Post subject: Re: Soldering Question
PostPosted: Mar Thu 01, 2018 12:34 am 
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Location: Ohio 45177
That is one thing about vintage and antique radios, soldering Litz and tinsel wire. Very tricky at first. Paste flux is your friend. I have some liquid flux but my gosh, that stuff is messy. Sticky residue everywhere on the container. Don't they still sell Kester rosin flux in the little cans? Non acidic type.


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 Post subject: Re: Soldering Question
PostPosted: Mar Thu 01, 2018 1:26 pm 
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Greetings to Don and the Forum:

Something I have always wanted and never owned is a solder pot. It works very well for applications such as those discussed here.... or so I'm told.

Regards,

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 Post subject: Re: Soldering Question
PostPosted: Mar Sat 03, 2018 10:44 am 
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Location: Cedar Rapids, Iowa, USA
I have a solder pot and it does help in these cases. If I remember correctly, an old trick was to take an aspirin tablet, put it against the wire, and then apply the soldering iron. I never tried it, and would not care to smell it. Also, as to a small flame on fine wires, I found that a match generates enough heat to melt them so they ball up at the ends.
My best results were from using fine emery cloth or sandpaper, and not using much pressure.


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 Post subject: Re: Soldering Question
PostPosted: Mar Sat 03, 2018 4:06 pm 
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Location: Ironwood, MI
tubemaster wrote:
If I remember correctly, an old trick was to take an aspirin tablet, put it against the wire, and then apply the soldering iron. I never tried it, and would not care to smell it.


+ 1

I keep a bottle of expired aspirin in my toolbox for this very reason. It works great but Old Tube
is correct, it generates a most acrid smell that requires that one must hold his breath until the fumes clear.


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 Post subject: Re: Soldering Question
PostPosted: Mar Sat 03, 2018 4:15 pm 
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Location: Litchfield Minnesota USA
When you all mention paste flux, it make me think plumbers soldering flux which is generally acidic, I think. I learned at the age of 8 the difference between plumbers soldering and electronic soldering.
So, I'm just curious. Is this past flux you speak of the same stuff plumbers use? If so, it can corrode badly after a while.
Mark D.


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 Post subject: Re: Soldering Question
PostPosted: Mar Sat 03, 2018 5:11 pm 
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Mark D wrote:
....... Is this past flux you speak of the same stuff plumbers use? If so, it can corrode badly after a while.
Mark D.
No, it's not the same, it's a non-acidic rosin flux similar to this:

https://www.amazon.com/Rosin-Paste-Flux ... B008ZIV85A

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 Post subject: Re: Soldering Question
PostPosted: Mar Sat 03, 2018 5:17 pm 
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Location: Litchfield Minnesota USA
Thanks for that information. Seems I've just never had anything like that, haven't seen a need. Yet...
Mark D.


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 Post subject: Re: Soldering Question
PostPosted: Mar Sat 03, 2018 8:05 pm 
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Location: Beautiful Downtown Burbank CA
What year did Nokorode change their formula from radio to plumbing?
I use this stuff for both.

Image

From RectoRseal (Nokorode®)
Lead free and acid free - safe to use on potable water systems.
Multipurpose for use with 95/5, 60/40, 50/50, and 40/60 solder.
Special oil base protects the solder joint against corrosive attack.


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 Post subject: Re: Soldering Question
PostPosted: Mar Tue 06, 2018 9:32 pm 
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Location: Georgia, 30236
I have a can of that Nokorode that I have used for my water heater and a couple of radios. It seems to want to crawl out of the can. Kind of messy.

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 Post subject: Re: Soldering Question
PostPosted: Mar Wed 07, 2018 4:47 am 
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Location: Southern Ga. zip 31768 US
For some of the old smaller stranded wire I have to strip back a little looks dirty anyway, I have seen this many times in older wire. Try cleaning the small stripped section in denatured alcohol and clean it again, let dry a few minutes and solder away.
This will work for a lot of old wires but no guarantee.

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 Post subject: Re: Soldering Question
PostPosted: Mar Wed 07, 2018 4:54 am 
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Location: Stone Mountain, GA
Have seen a tip to place the wire on an aspirin and heat with an iron. The aspirin will eat the corrosion.

I do have Nokorode and it works well. I think it is an acid. As long as you wash it off, it should be fine.

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 Post subject: Re: Soldering Question
PostPosted: Mar Wed 07, 2018 5:01 am 
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Joined: Jun Sat 09, 2007 8:14 am
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Location: Florida
I've always tinned litz wire by holding it in a bubble of solder on the tip of the iron. Crude but effective.

RRM


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 Post subject: Re: Soldering Question
PostPosted: Mar Wed 07, 2018 5:11 am 
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Joined: May Tue 30, 2006 7:28 am
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Location: Southern Ga. zip 31768 US
A hot solder tip bubble will, may work but I question how clean will it be (later)?

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 Post subject: Re: Soldering Question
PostPosted: Mar Wed 07, 2018 5:18 am 
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Location: Florida
Clean as any tinned wire. Had success for going on to six decades. If I find something that 's easier or works better I'll start doing that.

RRM


Last edited by Retired Radio Man on Mar Wed 07, 2018 5:27 am, edited 1 time in total.

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 Post subject: Re: Soldering Question
PostPosted: Mar Wed 07, 2018 5:25 am 
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Location: Georgia, 30236
When I prep a nasty wire with difficult to remove contamination, I take a little piece of 320 grit sandpaper and fold it in half and draw the wire end through it a few times.then flux and tin it.

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