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Restoration of braided flexible cable, circa 1925 (Low Voltage!)

AncientMariner
Managed to locate a pair of circa 1925 Ericsson BBC Headphones suitable for my similar age Ericsson Crystal Radio. The braided flexible cable looks a bit mucky.

I suspect that the inners are tinsel wrapped cotton similar to that used by Post Office Telephones in the days of plaited handset flexibles of the 1940s 50s. I guess there would be rubber overall insulation beneath the braid.


Question is, how to clean the cable up?  Ideas that have so far come to mind are 1) Hand hot water with some washing up liquid, or 2) electrical solvent such as Isopropyl Alcohol. I am a little wary as to be would be kinder to the rubber over insulation (If any) and the tinsel covered cotton?


Either way, or any other way, would be to afterwards jang the wet flex close to a CH radiator to dry out.


Thanks.

Clive

Parents
  • 0
    Well you are heating and exploding a small volume of cells to make a hole. I'd be quite surprised if that was not accompanied by a mechanical shock wave, just one scaled to the size of the bomb crater will be more of  'tick' than a bang.

      I guess this shock-wave propagates through the mounts for the eyeball, to the ear sensors without going round though the air outside The whole point is that all the energy is absorbed and turned to heat  in a very small volume, so unlike the radio detection, it will not be from effects deeper within or crystal set detection onto nerves of teeth.

    Still very glad it worked.


    (in a former life I was briefly laser safety man at a well known university and we managed to make air click at the focus of a lens in time with the rep-rate of a high power laser, an in the dark you could see the focal spot glow, even though the laser was IR.  We also blew up a lens as well, but that was a mistake..)

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  • 0
    Well you are heating and exploding a small volume of cells to make a hole. I'd be quite surprised if that was not accompanied by a mechanical shock wave, just one scaled to the size of the bomb crater will be more of  'tick' than a bang.

      I guess this shock-wave propagates through the mounts for the eyeball, to the ear sensors without going round though the air outside The whole point is that all the energy is absorbed and turned to heat  in a very small volume, so unlike the radio detection, it will not be from effects deeper within or crystal set detection onto nerves of teeth.

    Still very glad it worked.


    (in a former life I was briefly laser safety man at a well known university and we managed to make air click at the focus of a lens in time with the rep-rate of a high power laser, an in the dark you could see the focal spot glow, even though the laser was IR.  We also blew up a lens as well, but that was a mistake..)

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