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Default Help with wiring colors on old headphones

In article ,
"Dave Plowman (News)" wrote:

In article ,
Patrick wrote:
I have some vinatge headphones (Sennheiser HD424) and want to attach a
new plug.


Which color wires are the positive ones?


The colors in one of the leads are red & blue and in the other lead
black & yellow. (No wire is used as screening - there's just two wires
in each lead.)


Black and blue are the commons. Not that it would make any difference if
you commoned red and yellow.

You can check for sure by unplugging the leads from each actual earpiece
(red and blue plugs), but be careful to pull on the actual plug only. The
pins are of slightly different sizes.

Hope you have a source of the muffs for these - they crumble to dust quite
quickly.


I've been making my own for years, out of open-cell foam -- it comes for
free as packaging in all sorts of product boxes.

Isaac