[Elecraft] Yama CM-500 Replacement

[Dave Cole (NK7Z)]

The part of the Amazon ad located at:

https://www.amazon.com/Koss-sb45-SB-45-Communication-Stereophones/dp/B00081A2CW

that says:

"Oxygen-free copper voice coils improve signal transmission & conduction 
for a clearer & louder sound."

makes me wonder about the rest of the statements on the ad...

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
Award Manager, 30MDG Grid Contest
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 1/9/19 3:38 AM, Mike Harris via Elecraft wrote:
> Hi,
> 
> I bought a pair of Koss SB-45 when my CM-500 ear cushion covers started 
> disintegrating leaving the dreaded black dandruff. My wife fabricated a 
> couple of fabric covers and the problem was resolved. Recently I was 
> sent a pair of fabric earphone covers by a friend obtained from Amazon 
> who for some reason won't ship to the Falklands. They are simple 
> elasticated covers and they slip over the ear pieces. A satisfactory 
> extension to the life of the CM-500.
> 
> Returning to the Koss  SB-45. I substituted them for the CM-500 and a 
> local could hardly detect any difference. The mic boom is a bit more 
> springy and take a bit more effort to tailor to the individual 
> preference. The cord is much lighter than the CM-500 which could be a 
> weak point. Mine have been in the draw for a couple of years unused 
> because the CM-500 are refusing to die.
> 
> Regards,
> 
> Mike VP8NO
> 
> 
> 
> On 09/01/2019 02:51, Walter Underwood wrote:
>> I’ve heard good things about the Koss SB-45. It has an electret mic 
>> and is about half the cost of the CM-500, at $25. I have not used the 
>> SB-45.
>>
>> https://www.amazon.com/Koss-sb45-SB-45-Communication-Stereophones/dp/B00081A2CW 
>>
>>
>> I would not get the Koss SB-40. That looks like the Yamaha, but has a 
>> dynamic mic that has gotten some bad reports.
>>
>> A while back, I took a close look at the mic plug on my Yamaha CM-500 
>> headset. It is labeled “Koss”.
>>
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ (my blog)
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