[R-390] Soldering Fine Gauge Wire

[Dan Merz]

Al,  I've done a few repairs similar to your task .  I never liked the "heat
it in solder until" technique - some coatings just are very resistant.  I've
gone down to about #44 wire size - and I scrape the wire by holding a flat
piece of metal on one side and lightly scrape with a scalpel or xacto
knife.  You have to work different sides of the wire so it takes a little
time - it helps to have a magnifier.  Then when I've seen enough copper, I
fashion a splice  with small bare copper wire wrapped on the two ends you
want to join,  #38 or smaller,  and solder the two joints.  Fine tweezer
help here.   I've had very good success with this,  especially on
transformer windings and rf coils.  Dan.

Albert Solway wrote:

> To All,
>
> Some time ago there was a request on how to remove the the insulation on
> fine gauge wire as used in IF Transformers.   One of the responses was
> to use an aspirin to remove the insulation. My question is, what is the
> procedure. Any other  techniques would also be appreciated.
>
> The wire from L52, part of  T1 in my SP-600, was broken. The remaining
> useable length is about 0.5 inch to short to reach the terminal it goes
> to. A splice is needed. I tried solder with only a flux and the iron
> without success. The insulation is a high temp type and will not melt
> with the soldering iron. The broken wire was most likely the original
> fault in the SP-600. I found it by accident while replacing the BBODs.
>
> Thanks and have a good day.
>
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