On Wed, 15 Nov 2017 03:12:21 -0800 (PST), jack4747@gmail.com declaimed the
following:

>Il giorno mercoledì 15 novembre 2017 11:59:14 UTC+1, David ha scritto:

>> Thanks - in the other thread so I must have overlooked it.
>> Not sure what you mean by "phone jack version" - I tend to think of phone
>> jacks as an RJ11 (or variant) type plug.
>>
 
>
>yes I meant audio jack (3.5 mm). Somewhere else in the thread it was called
"phone jack" (form headphone I think) so I used the same name for the sake of
continuity.
>

 The 1/4" TS jack/plug (along with TRS, and even more R versions)
originated with the old, manual, telephone switchboard, where operators
made connections by plugging cables into various sockets. Hence, "phone
jack/plug".

 RCA jacks/plugs, OTOH, are also commonly referred to as "phono
jacks/plugs" -- originally used for connecting phonographs to an amplifier.
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