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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 20th Jun 2022, 8:18 am   #1
Gridiron
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Default Set of three Ivalek SW coils

I found these in a box of miscellaneous stuff I was given. Three coils each with 2 windings to fit 4 pin B4 type valve holder, presumably for a simple SW receiver with reaction. Does anyone have any info, I only know of Ivalek crystal sets.
Mike.
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Old 22nd Jun 2022, 10:01 am   #2
G3PIJpeter
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Default Re: Set of three Ivalek SW coils

The web page at https://www.bertibenis.it/Radio%20a%...ek%201%20E.htm describes the Ivalek crystal set but the caption also includes the statement: "... The cabinet of this radio is similar to the one of tube radio but itís smaller" - which (although rather oddly worded) implies that there was an Ivalek valve receiver.
Peter
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Old 22nd Jun 2022, 10:05 am   #3
G3PIJpeter
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Default Re: Set of three Ivalek SW coils

Also, these Ivalek coils were advertised - see https://worldradiohistory.com/hd2/ID...-02-IDX-60.pdf - but by M. Allen Radio and not directly by Ivalek. See also Lot 86 for a 2008 BVWS auction at https://www.bvws.org.uk/auctions/res...assett-special
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Old 22nd Jun 2022, 1:10 pm   #4
Gridiron
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Default Re: Set of three Ivalek SW coils

Thanks for the information, Peter, a bit earlier than I thought (1948). It would be interesting to know if any commercial receivers or kit set designs used these or if they were only used by amateur constructors.
Mike.
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Old 22nd Jun 2022, 3:26 pm   #5
G3PIJpeter
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Default Re: Set of three Ivalek SW coils

Quote:
Originally Posted by Gridiron View Post
... a bit earlier than I thought (1948). It would be interesting to know if any commercial receivers or kit set designs used these or if they were only used by amateur constructors.Mike.
There were a lot of 'kitchen table' and 'underneath the arches' businesses in those immediate post-war years, often recycling or re-purposing piles of pre-war stuff that had been dug up from somewhere or fallen off the back of a lorry. Who made the Ivalek coil formers and where and when? Who then wound on the wire? How many were available for sale and over what period of time? A browse through radio magazines of the time indicates that many firms built and advertised complete radios for a time and then disappeared. Others, like Panda Radio later on, prospered for a while. There's a history of invention and 'make do and mend' radio 1945 - 1955 waiting to be written.
Peter
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