[Elecraft] A "My K3's coming question"

[Robert Tellefsen]

Thanks Don
I still have my K2 #12, and the jack is still good in it,
also.  At present it sits to the side, though, as my
newer unit is on the desk on-line for Sweepstakes.
73, Bob N6WG

----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Robert Tellefsen" <n6wg at comcast.net>
Cc: "elecraft" <elecraft at mailman.qth.net>
Sent: Wednesday, November 07, 2007 10:28 AM
Subject: Re: [Elecraft] A "My K3's coming question"


> Bob,
> 
> The problem with the K2 headphone jack has nothing to do with neither 
> mono or stereo nor with the contacts.  There is a built-in independent 
> switch at the back of the jack body whose activating arm  breaks and the 
> the path to the speaker remains open after the headphone plug is 
> removed.  I have done postmortem disassembly of several of those jacks 
> and find the same fault with all of them - the switch activating arm in 
> the jack is a plastic lever and seems brittle to me.
> 
> That being said, the headphone jack in my K2 and many many others I know 
> of has not failed.  Yes, the failure percentage is higher than one might 
> expect, but not all of them fail.  Now, if the jack manufacturer would 
> just use a less brittle material for that activating arm, the entire 
> problem would be solved.
> 
> 73,
> Don W3FPR
> 
> Robert Tellefsen wrote:
> > Lyle
> > Is that rear panel mic jack a true
> > tip-ring-sleeve jack or a simple mono jack?
> > If simple mono, I'd be uncomfortable
> > putting a stereo plug into it.  Too many
> > folks have had trouble with the K2's
> > headset jack.    I'm a bit leery of small
> > jacks in general due to the small leaf
> > springs in them.
> >   
> >