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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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Old 14th Jul 2015, 11:13 am   #1
Neil Purling
Nonode
 
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
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Default Coil Formers

I have a pair of Coil Formers. They were sold as Eddystone, but are un-marked.
There are six pins, which do not correspond with an Octal valve base. They are a larger diameter circle and the pins are thicker.
To use these I am going to need something to plug them into.
I don't know their age, so I don't know if the 'right thing' would be for screw fit to a baseboard or into a punched chassis hole.
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Old 14th Jul 2015, 4:39 pm   #2
Alf
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Default Re: Coil Formers

Except for missing pin1, it looks like it could plug into a B7 valve base.
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Last edited by Alf; 14th Jul 2015 at 4:45 pm.
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Old 14th Jul 2015, 9:04 pm   #3
Ed_Dinning
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Default Re: Coil Formers

Hi Neil, it may be possible to get insulated sockets for these depending on the pin diameter.
In use they were often plugged into simple turned brass sockets that were fitted into the ebonite baseboard.
Do you have access to a lathe?

Ed
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Old 14th Jul 2015, 10:22 pm   #4
emeritus
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Default Re: Coil Formers

Similar coil formers (plain as yours evidently originally were, or threaded at 14 tpi), various made-up coils wound on the formers, and two different types of socket for them, are illustrated in the 1938 Eddystone Short Wave Components Catalogue: PDF extract attached. Possibly yours pre-date 1938 as they have straight split contact pins rather than the helically slotted pins of the 1938 versions.
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Last edited by emeritus; 14th Jul 2015 at 10:36 pm.
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