[Elecraft] headphones for k3 / kx1

[Brett Howard]

Agreed its VERY tough to find a set of headphones that meets the K3
requirements.  

This last field day I'd not yet changed my caps out and so I brought
along a headphone amplifier that had an input impedance of 18Kohms and
used that to drive my headphones.  

For another point of reference the caps that I installed in my K3 are
Mouser part number: 871-B41112A3107M000.  The only annoyance is that
they start shipping the Mouser catalog.  I thought it was annoying
enough getting them at work....  But now I get them at home too. ;)

~Brett

On Sun, 2009-08-23 at 22:23 -0400, Paul Christensen wrote:
> > However being that you mention the K3 you'll want to either ensure you
> > use higher impedance headphones or ensure that you change the series
> > caps in the headphone circuit from 10uF to 100uF.
> 
> Not too many high-end headphones will be available with an average Z of more 
> than 100 ohms across the audio spectrum.  With the stock 10uF caps in the 
> K3, one would need to find a set in the area of 200-ohms or so to extract 
> decent low-end response.  When you get up in that Z range, the available 
> headphone options quickly diminish.
> 
> Several SMD replacement caps exist for the K3's headphone coupling caps at 
> C9, and C13, but Mouser P/N 647-UUD1A101MCL (made by Nichicon) is a good 
> choice at only 65-cents each.
> 
> Paul, W9AC 
> 
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