[HBR] 24-5P Molded Coil Forms

[Paul Dulaff]

All

Good information on the National Regens.

Can we use the same diameter and height for the coil form for both the HBR and the National, assuming we raise the height of the coil form to what works on 160 meters for the HBR ? 

Where can I find the base dimensions of the 6 pin coil forms for these receivers ?

Is there a need for 4 pin coil forms ?

Best 73's all

Paul - WB2NMI

----- Original Message -----
From: William Wood <ke9xq at charter.net>
To: HBR Receiver List <hbr at mailman.qth.net>
Sent: Tue, 08 Nov 2016 12:52:02 -0500 (EST)
Subject: Re: [HBR] 24-5P Molded Coil Forms

Here’s at least a start to the SW 3 info gathering
73 fer now
Bill  KE9XQ

http://www.antiqueradios.org/gazette/SWevol.htm



On Nov 8, 2016, at 11:07 AM, Rob <roomberg at ptd.net> wrote:

> Can you point to any magazine article that shows how to build this SW-3?
> 
> On 11/08/2016 11:46 AM, Jim Hill wrote:
>> At 07:32 AM 11/3/2016, Paul Dulaff wrote:
>> If additional coil sales would reduce startup costs, I suggest you also look into manufacturing National SW-3 coil forms.  The SW-3 was a regenerative receiver sold in the early 30's, and is currently a very desirable item.  It uses a 6-pin coil form with normal pin diameters, but with different pin spacing (since the receiver was designed and originally sold before 6-pin tubes were available).  If you are interested, I'll provide details.
>> Jim
>> 
>> At 07:32 AM 11/3/2016, Paul Dulaff wrote:
>>> All
>>> Looking at the potential for tooling up, in a low cost way, the HBR coil form. This would be an exact piece, injection molded clear styrene with 5 pins, ti 
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