[Elecraft] [OT] Broken boom mic attachment on a CM-500

[Walter Underwood]

Replacement ear pads are available, but the internal wiring is very fragile.

I managed to get the replacements on, but broke a wire. After three breaks and four re-solderings, there wasn’t enough wire left to work with, so I bought a new headset.

The Koss UR-20 is the same headphones as the Yamaha CM-500 and Koss SB-40, but without a boom mic. The link to these replacements was posted in this email reflector almost exactly a year ago (11/1/19) by Josh W6XU. These are the ones I ordered.

https://www.koss.com/accessories/cushions/ur20-ear-cushion <https://www.koss.com/accessories/cushions/ur20-ear-cushion>

This video walks you through the replacement steps.

https://www.youtube.com/watch?v=Gz-atFziEz4 <https://www.youtube.com/watch?v=Gz-atFziEz4>

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Nov 2, 2020, at 1:50 PM, Alan - G4GNX <g4gnx at g4gnx.com> wrote:
> 
> My CM500 certainly has an electret insert and it came with a separate plug-in battery bias pack.
> 
> Unfortunately the ear pads are starting to deteriorate. Have you had to replace yours? If so, with what? ISTR I read somewhere that new separate pads are not available.
> 
> 73,
> 
> Alan. G4GNX
> 
> 
> ------ Original Message ------
> From: "Jim Brown" <jim at audiosystemsgroup.com>
> To: elecraft at mailman.qth.net
> Sent: 02/11/2020 02:59:17
> Subject: Re: [Elecraft] [OT] Broken boom mic attachment on a CM-500
> 
>> Hmmm. I've used nothing but a CM500 since about 2008, and I've never seen one with a dynamic mic. The data sheet for all of them has said it was dynamic, but none of then were.
>> 
>> 73, Jim K9YC
> 
>> 
> 
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