[Boatanchors] Octal versus Magnal?

Fuqua, Bill L wlfuqu00 at uky.edu
Wed Jan 8 18:51:27 EST 2014

  Kind of reminds me of the Sub-D connectors.
Today. actually started in the 1980s, you hear terms like DB9, DB15 connectors while in fact they are
DE9 and DA15, along with the DB-25, DC-37 etc.
Bill wa4lav

From: Boatanchors [boatanchors-bounces at puck.nether.net] on behalf of qrv at kd4e.com [qrv at kd4e.com]
Sent: Wednesday, January 08, 2014 6:45 PM
To: Chuck McGregor
Cc: multi_elmac at yahoogroups.com; BoatAnchors; heathkit at yahoogroups.com; HEATH at lists.tempe.gov; Galaxy-WRL at yahoogroups.com
Subject: Re: [Boatanchors] Octal versus Magnal?



        Thanks for the explanation, love to learn new things.


> Jim & David-
> The socket generally called Magnal has 11 pins in a 1-1/8 inch diameter
> circle and is used on the 2AP1 CRT and others.   The socket having 11
> pins on a ~3/4 inch circle, Amphenol Series 78, part #78-11S  does NOT
> mate with Magnal plugs and lacks a common name.  Many users refer to all
> of the Series 78 sockets having a center post similar to an octal
> socket, as "octal with a number of pins".   While this may be an abuse
> of "octal" which has its root as the number 8, it does provide a name
> for the socket.
> Historically, Amphenol had Series 78 plugs and sockets from 4 to 12 pins
> in manufacture and general use from the 1930's.  Socket #78-8S is
> identically the octal socket pattern used for tube sockets.  The plug
> equivalent is #86-CP8 and was described in their 1945 catalog as
> "8-prong octal".  The same list describes plug 86-CP9 as "9-prong (octal
> style)"  and 86-CP11 as "11-prong (octal style)".   The larger Magnal
> CRT socket was listed as Amphenol part #49-SS11L and described as
> "Magnal steatite socket". (steatite was a ceramic tradename).
> 73,
> Chuck K7MCG
> On Wed, Jan 8, 2014 at 8:41 AM, qrv at kd4e.com <mailto:qrv at kd4e.com>
> <qrv at kd4e.com <mailto:qrv at kd4e.com>> wrote:
>     I trust that Jim will not mind me sharing his interesting
>     post from an eham discussion thread from last year:
>     http://www.eham.net/ehamforum/__smf/index.php?topic=84048.0
>     <http://www.eham.net/ehamforum/smf/index.php?topic=84048.0>
>     ------------------------------__------------------------------__----
>     The 11 pin plug/socket used by Heath and some others, and
>     for relays, has a correct name:
>     It is "magnal".
>     "11 pin octal" is an oxymoron, because "octal" means "having 8"
>     Don't ask how I know this.
>     73 de Jim, N2EY
>     ------------------------------__------------------------------__----


David (NOT Dave) Colburn, KD4E - Nevils, Georgia USA

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