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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
    Hi David

    Well, you have got me thinking now. To me the "click" was from the equipment, never for one moment thought that it was "internal". I am seeing the Consultant Ophthalmologist in six weeks time, so will ask whether he heard it too.  Pleased to hear that your daughter's treatment went well.


    I have experienced other "internal hearing" phenomena. About 1976 I visited the Decca Navigator Radio Station at Neston, Wirral. This used to transmit mainly on 70.5375 kHz, it being the Green Slave; but the nominally continuous wave transmission were in fact divided into a 20-second cycle, with each station in turn simultaneously transmitting all four Decca frequencies (5f, 6f, 8f and 9f) in a phase-coherent relationship for a brief period of 0.45 seconds each cycle.it also transmitting during its cycle on, in the case of Neston 84.645 kHz, 112.86 kHz, 115.6815 kHz and 126.9675 kHz as well, there additionally being a 8.2f as well)


    We were invited into the Aerial Tuning Unit hut at the base of the "Tee" aerial and you could feel the keying sequence as a sensation. Then some years later when using my GSM phone in my cabin (a steel box with a couple of windows) I could feel the GSM keying just above my ear, same cadence as when in an aircraft and as you approach a country from an over sea route you can hear the GSM phones making contact as audio interference on the PA system.

    Clive




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  • 0
    Hi David

    Well, you have got me thinking now. To me the "click" was from the equipment, never for one moment thought that it was "internal". I am seeing the Consultant Ophthalmologist in six weeks time, so will ask whether he heard it too.  Pleased to hear that your daughter's treatment went well.


    I have experienced other "internal hearing" phenomena. About 1976 I visited the Decca Navigator Radio Station at Neston, Wirral. This used to transmit mainly on 70.5375 kHz, it being the Green Slave; but the nominally continuous wave transmission were in fact divided into a 20-second cycle, with each station in turn simultaneously transmitting all four Decca frequencies (5f, 6f, 8f and 9f) in a phase-coherent relationship for a brief period of 0.45 seconds each cycle.it also transmitting during its cycle on, in the case of Neston 84.645 kHz, 112.86 kHz, 115.6815 kHz and 126.9675 kHz as well, there additionally being a 8.2f as well)


    We were invited into the Aerial Tuning Unit hut at the base of the "Tee" aerial and you could feel the keying sequence as a sensation. Then some years later when using my GSM phone in my cabin (a steel box with a couple of windows) I could feel the GSM keying just above my ear, same cadence as when in an aircraft and as you approach a country from an over sea route you can hear the GSM phones making contact as audio interference on the PA system.

    Clive




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