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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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1st Sep 2014, 12:37 pm | #1 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,960
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Coil core locking in Transistor Radios
Does anyone know of a source of that tiny square section rubber strung used for core locking in sixties and seventies transistor radio RF and IF coils? It tends to perish over the years and sometimes needs replacing.
For substitutes, I have fitted small strips of writing paper longitudinally between the core and the former, as used in some GEC and Masteradio transistor sets. I have also tried a smear of that stiff silicone grease sold by Maplins, which also does the job of preventing the small cores moving too easily. On the other hand, cut up rubber bands seem to be too hard and risk core breakage. Ron |
1st Sep 2014, 1:09 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
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Re: Coil core locking in Transistor Radios
I usually strip the rubber cores out of a bit of elastic.
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1st Sep 2014, 2:40 pm | #3 |
Guest
Posts: n/a
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Re: Coil core locking in Transistor Radios
I was going to say 'the wifes knickers', an alternative is plumbers PTFE tape.
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3rd Sep 2014, 2:52 pm | #4 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,960
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Re: Coil core locking in Transistor Radios
Thanks to both of you for your suggestions.
Ron |
3rd Sep 2014, 3:19 pm | #5 |
Heptode
Join Date: Jul 2012
Location: Bromley, London, UK.
Posts: 702
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Re: Coil core locking in Transistor Radios
Another thought. What about the elastic cord you often get on luggage tags sent out by travel companies?
Mike |