[Boatanchors] National SW-3 Coil Forms Wanted

[Al Klase]

Gang,

After making some careful measurements on an original coil, here's my 
reconstructed (dimensions adjusted to even numbers) drawing.



All pins are 0.120 in diameter.

Hope this helps,
Al

ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 9/1/2022 12:13 PM, William Cromwell wrote:
> Hi Scott,
>
> There are a lot of reasons besides 'nostalgia' to not modify the 
> radios. I was hoping somebody might be ready to sell some surplus 
> coils, too. What I have in mind to fabricate would not be mistaken for 
> original equipment but would fit the existing sockets. I started on 
> that project several years ago but I got sidetracked by family 
> matters. I can't find my notes - including measurements of the pins 
> and their spacing. I do have all the winding specs from National :) I 
> want to get started soon but right now 'the pattern is full'. I have a 
> pair of coils that cover 160 meters and one pair of bare forms.
>
> 73,
>
> Bill KU8H
>
> bark less - wag more
>
> On 9/1/22 09:39, whitebear1122 at comcast.net wrote:
>> Hi Bill, Yes, that is an option to change the sockets but I won't do 
>> that.  It would be a major disruption of the radio and not be an SW-5 
>> to me anymore.  I am fine using reproductions, or damaged wire coils 
>> and rewinding them myself. I was hoping to at least come up a set of 
>> damaged wire coils for rewinding.
>>
>> 73 Scott WA9WFA
>>
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