Another vote for the KOSS SB45, especially as it is much easier to buy in the 
UK.

I had a CM500 but the mic broke after about a year, so I kept it just as a pair 
of stereo headphones.

73 from David GM4JJJ

> On 26 May 2016, at 17:06, John <jkra...@iafrica.com> wrote:
> 
> I use the KOSS SB45, it has the same electret element as in the Yamaha. In 
> fact
> it is almost identical to the Yamaha, but uses silver ear cups. I understand 
> some
> of the components used in the Yamaha are made by Koss…perhaps the CM500
> is made in the Koss factory, but labeled Yamaha ?
> Terrific RX and TX audio with my KX3 and Flex rigs using my Koss SB45 - make 
> sure
> you get the SB45 (electret) and not the SB40 (dynamic)
> 
> 73
> John
> 
> 
> 
> 
> 
> On 26 May 2016, at 4:14 PM, Mike Harris <mike.har...@horizon.co.fk> wrote:
> 
> Hi,
> 
> If I remember correctly the Koss SB45 headset has been offered as a suitable 
> substitute for the K3 weapon of choice the Yamaha CM500. Any experience out 
> there?
> 
> My much used CM500 are starting to shed the leatherette covering and the foam 
> inside the cavities is wearing away. CM500 can be rather difficult to source.
> 
> Regards,
> 
> Mike VP8NO
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