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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 Clive,

    I did not have the same procedure as yourself, but another type of laser treatment following cataract surgery, my clicks were definitely internal. My daughter had the same procedure as yourself and had a similar experience to me.  I will be interested what your consultant says.

    Your tales of hearing transmitters triggered a memory of when in my much younger days I worked at Rugby on the GBR 16 kHz transmitter.  My young ears could hear the transmission, although I suspect that it was various bits of equipment vibrating with the carrier rather than hearing the R.F.
    Scrabbling around in the aerial loft was an eye opener, huge aerial tuning capacitors and coils, interconnectors of litz wire 2 or 3 inches diameter, that despite their size were very flexible.  I was there measuring the radiation resistance after some changes to the capacity top to the aerial, and was astonished to find that when terminated, the Droitwich 200 kHz transmitter put half an amp down the GBR aerial.


    David

Reply
  • 0
    Hi Clive,

    I did not have the same procedure as yourself, but another type of laser treatment following cataract surgery, my clicks were definitely internal. My daughter had the same procedure as yourself and had a similar experience to me.  I will be interested what your consultant says.

    Your tales of hearing transmitters triggered a memory of when in my much younger days I worked at Rugby on the GBR 16 kHz transmitter.  My young ears could hear the transmission, although I suspect that it was various bits of equipment vibrating with the carrier rather than hearing the R.F.
    Scrabbling around in the aerial loft was an eye opener, huge aerial tuning capacitors and coils, interconnectors of litz wire 2 or 3 inches diameter, that despite their size were very flexible.  I was there measuring the radiation resistance after some changes to the capacity top to the aerial, and was astonished to find that when terminated, the Droitwich 200 kHz transmitter put half an amp down the GBR aerial.


    David

Children
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