[Boatanchors] Mystery Clark headset plug question

[manualman at juno.com]

They're called TRRS plugs. The design is used with a lot of audio/video
stuff and Ipods, Ipads, Iphones. Unfortunately, they all seem to use the
3.5mm diameter (roughly 1/8 inch). Plugs and jacks are relatively cheap.
Can't find anyone selling a TRRS plug or jack with .28 inch diameter.

Pete, wa2cwa

On Tue, 16 Aug 2011 20:26:02 -0700 Ken Kaplan <krkaplan at cox.net> writes:
> I have a David Clark H7041 headset that has a special plug. It looks 
> 
> like a short 1/4 plug but it is actually .280 in diameter and 3/4 
> inch 
> long. It has 4 contacts (2 for the mic & 2 for the phones). A guy in 
> my 
> local pilots shop said it is used in helicopters but I got the 
> headset 
> from a shop that works on fire trucks. I think it was used on either 
> 
> their radio or intercom (or both). The pilot shop had an adapter 
> that 
> converted it to a pair of standard 1/4 stereo plugs for $56! A 
> picture 
> of the plug is here:
> 
> http://www.qsl.net/kb7rgg/radio/images/plug.jpg
> 
> Anyone know where I can get a socket for this plug?
> 
> 73 Ken kb7rgg