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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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8th Dec 2021, 11:55 am
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#1 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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What are these coils for?
Had these turn up in a box of bits, what are they for. Unfortunately my Chinese do everything tester reads them as resistors. Thanks
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8th Dec 2021, 12:03 pm
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#2 |
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Hexode
Join Date: Mar 2008
Location: Bristol, UK.
Posts: 388
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Re: What are these coild for
GPO resistors,someone will tell you exactly how they were used.Les
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8th Dec 2021, 12:37 pm
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#3 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: What are these coild for
So my cheap Chinese test anything was right!
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8th Dec 2021, 1:17 pm
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#4 |
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Octode
Join Date: Mar 2016
Location: Knutsford, Cheshire, UK.
Posts: 1,500
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Re: What are these coils for?
Wound with some sort of resistance wire perhaps?
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...where on earth did that spring/screw go?? |
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8th Dec 2021, 5:31 pm
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#5 |
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Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,130
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Re: What are these coils for?
... and presumably wound back upon themselves to cancel out any inductance.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
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8th Dec 2021, 8:17 pm
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#6 |
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Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
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Re: What are these coils for?
I remember a bunch of those - they were non-inductively-wound and also had a temperature/resistance coefficient that compensated for some other odd thermal-coefficient elsewhere in the network.
They were used in an early solid-state 'line-driver' which featured Germanium CV4001-4007 series transistors in an encapsulation that was instantly identifiable as having been made by Texas Instruments Bedford.
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I'm the Operator of my Pocket Calculator. -Kraftwerk. |
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11th Dec 2021, 1:21 pm
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#7 |
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Hexode
Join Date: Jan 2006
Location: Greater Manchester, UK.
Posts: 373
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Re: What are these coils for?
I did have a load of similar components to these I always assumed that they were resistors.
My friends father whom I got them off did work for the GPO. |
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11th Dec 2021, 1:56 pm
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#8 |
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Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,195
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Re: What are these coils for?
Also used in similar format and non inductively wound on power system protective relays
Ed |
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11th Dec 2021, 3:40 pm
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#9 |
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Tetrode
Join Date: Apr 2021
Location: North Surrey, UK.
Posts: 67
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Re: What are these coils for?
Resistor, spool No.9. Used by the million in Strowger selectors and relay sets.
They were simple wire-wound power resistors as far as I remember, but there may have been special non-inductive wound ones. There were lower wattage versions wound on a plastic bobbin. |
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13th Dec 2021, 6:23 pm
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#10 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: What are these coils for?
Thanks for all the info
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