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 Post subject: 9 pin plug (Octal type)
PostPosted: Nov Fri 08, 2019 10:03 pm 
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I ran across this Amphenol plug, which at first I thought was an octal, but i quickly noticed it has 9 pins instead of 8.

I'm quite familiar with the 11 pin version used with 3 pole double throw relays, but this is new to me.
And, Ive been around the block many times. :wink:

-Steve


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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Fri 08, 2019 10:53 pm 
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You are talking about Amphenol series 86-CP plugs. Plugs with 4,5,6 or 7 pins were identical to tube bases. Plugs with 8, 9, or 11 pins had the keyed center post, like an octal tube base. Series 78-S were the matching sockets. Adding a snap-on backshell made them into series 78--PF female connectors or series 86-PM male connectors. All this is in catalogs, or Radio's Master catalog from the late 1940's.

-Chuck


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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Fri 08, 2019 11:03 pm 
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I will look in one of my Radio Master catalogs as I have a few of them.

Thanks! I just hadn't run across the 9 pin that I know of before. :D

-Steve

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Fri 08, 2019 11:12 pm 
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I'd call it a "noctal" plug. ;-)

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Sat 09, 2019 7:19 am 
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EF Johnson used the 9 pin female connector mate on several of their transmitters.
Here's the back of a Johnson Ranger:

Image

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Sat 09, 2019 9:49 am 
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Greetings to Steve and the Forum:

I should also point out that they are the most rare and hard to find of all of the not-8-pin "octal" plugs. Don't carry any of them on your person around a vintage ham fest. You will be mugged! :D

Regards,

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Sat 09, 2019 11:23 pm 
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Finding items like these are why I always look at the boxes of cables and grubble under the tables at the hamfests.

9 and 11 pin octals were fairly common once upon a time and several ham equipment, electronic organ, and some Avionics manufacturers used them.

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Sun 10, 2019 12:29 am 
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manualman wrote:
EF Johnson used the 9 pin female connector mate on several of their transmitters.
Here's the back of a Johnson Ranger:

Image


I just looked at both my Ranger and my Valiant and yes, they both have the 9 pin version, along with a plug with jumpers.
I will probably stash this extra one I have inside the Valiant for safe keeping. :D

Thanks!

-Steve

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Sun 10, 2019 12:38 am 
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The 11 pin versions were in common use on many CB's of the 60's and 70's. And many had both an AC cord and a DC cord with the 11 pin connector.

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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Tue 19, 2019 7:42 am 
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9 pin are also commonly used for the bases of the late 1950's to mid 1970's? microphone input transformers such as those made for/by RCA, U.T.C., Triad, Newcomb, Webster Electric, Bogen, Lowell, etc and as "wired up Hi-Z or phono" plug ins for mixer (pre) & amplifiers of that era as well.


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 Post subject: Re: 9 pin plug (Octal type)
PostPosted: Nov Tue 19, 2019 5:27 pm 
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Thanks! Now that I know about them, I will be keeping an eye out at hamfests!

I saw a vendor at the Fort Wayne hamfest Saturday with many 8 and 11 pin types but no 9.

Best purchase was a flat bed scanner for $1 (works great even in Linux!) and a Millen GDO for $15!

-Steve

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