Soldering cartridge coil wires?

the thin end of the wedge
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vanakaru
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Soldering cartridge coil wires?

Post by vanakaru » 31 Aug 2019 08:02

I need to resolder thin coil wires to the pins. What is used to clean the wire coating?

aardvarkash10
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Re: Soldering cartridge coil wires?

Post by aardvarkash10 » 31 Aug 2019 09:39

oh my lord. Wire INSIDE the cart, or the external leads?

Alec124c41
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Re: Soldering cartridge coil wires?

Post by Alec124c41 » 31 Aug 2019 10:21

My only experience with this was a Shure M-97HE, that had one pin with insufficient solder. I used needle-nose pliers and an elastic band as a heat sink at the base of the pin, and ran a droplet of solder into the end of the pin. It worked.
Delta667 has more experience.

Cheers,
Alec

vanakaru
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Re: Soldering cartridge coil wires?

Post by vanakaru » 31 Aug 2019 10:58

Thin coil wires are inside the cart. These are coated with something like lacquer or epoxy. Obviously it would not be possible to scrape the coating off. There must be some other method to prepare the ends for soldering.
Alec, the wires are broken off. I have no problem soldering - I have the experience and tools. I am not going to melt the plastic where the pins are attached.

wumpling
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Re: Soldering cartridge coil wires?

Post by wumpling » 31 Aug 2019 11:37

Is the brown residue old flux? Meths was a good cleaner for this back in the day.

vanakaru
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Re: Soldering cartridge coil wires?

Post by vanakaru » 31 Aug 2019 13:45

There is no brown residue. The wires are coated for insulation. I need to get that off in order to tin the ends. I tried to bath them in the solder but the result was not satisfactory.

Athermos
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Re: Soldering cartridge coil wires?

Post by Athermos » 31 Aug 2019 14:06

Step 1. Clean the soldering iron bit.
Step 2. Heat it and when it reaches the desired working temperature, put a drop of solder on the bit and dip the bit in rosin (flux)
Step 3. Now tin the end of the coil (wire) with this. The rosin and the solder somehow manages to remove the insulating coating and tin it. Works every time.

aardvarkash10
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Re: Soldering cartridge coil wires?

Post by aardvarkash10 » 04 Sep 2019 07:41

yeah to get the enamel off the wire, clamp off 5mm of the wire with needle-nose pliers to stop the heat running up the wire into the coil, and then heat the 5mm section with a cigarette lighter or match flame. This burns the enamel and GENTLE scraping will flake the burnt enamel off the wire.

Then you can solder it...

33audio
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Re: Soldering cartridge coil wires?

Post by 33audio » 04 Sep 2019 09:45

https://www.digikey.com/product-detail/ ... -ND/307002

They are expensive. Last time I looked they were $35.00.

This is silvered acrylic for circuit board repair. Highly conductive.

Drip a little down into the pin. All it needs is a small area of exposed
metal on the wire.

They dry out. MEK will thin it. Left handed threads when taking it apart.

Used it many times. The pens will last for many years, but they need MEK
before use. (Methyl Ethyl Ketone available at hardware stores).

They also have a $17.00 pen with nickle instead of silver. May be just as good.
I bought a small jar of nickle acrylic. Inferior to silver and not useable.

Silver Acrylic is a safe but expensive alternative. Regards, Mark

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