A follow-up ...
Since I had two pairs of CM-500 that needed refurbishment
(my original pair - without any cushions - and my current
pair - that is starting to flake), I took a chance and
ordered cushions for the Koss QZPRO.
<https://koss.com/products/qzpro-ear-cushion>
They arrived a couple weeks ago and appear to be a perfect
fit for the CM-500. I would guess they are the same as the
suggested UR-20 cushions (which are "Sold Out").
As the foam was also gone (original pair) or falling apart
(current pair), I started looking for a suitable replacement
as I did not want to do a cut up sock and double stick tape
as suggested in one You Tube video. I found these:
<https://www.amazon.com/dp/B07WN8SWHR>
These are 90 mm round and I was able to simply tuck them
between the QZPRO cushions and the face of the CM-500
"speakers" after installing the new cushions. There was
no need to cut them down to fit the recesses of the CM-500
and hold them in place using double stick tape. The foam
is a bit thicker and softer than the original Yamaha (Koss).
Finally, and probably not necessary, I added cloth covers ...
<https://www.amazon.com/dp/B09B7JCY8H>
Although I took a chance and got a spare set of the cushions and
foam disks for each of my CM-500s, I decided the extra protection
from sweat, etc. was probably worthwhile for the long term. I
went with black but a station with multiple operators could use
a different color for each operator.
All in all, replacing the cushions and adding new foam is quite
easy - no broken speaker wires if one is careful. Getting to
the three screws (Phillips #0) is easy once one learns where
they are (front and +/- 120 degrees). For $18 total per headset
for cushions ($5), foam disks ($9) and covers ($8 for 2 pair)
the cost is far less than an equivalent replacement headset
(the CM-500 is currently $60 on Amazon).
73,
... Joe, W4TV
On 5/8/2023 6:14 PM, Joe Subich, W4TV wrote:
On 5/2/2023 12:03 PM, Walter Underwood wrote:
The Koss UR-20 is the same headphone 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 (11/1/19) by Josh W6XU. These are the
ones I ordered.
Unfortunately, the SB-40 ear cushions are "Sold Out" at Koss. The
QZPRRO headset ear cups appeared to be the same size/shape so I
ordered a couple pairs (both of my CM-500s need new cushions) and
they fit just fine: <https://koss.com/products/qzpro-ear-cushion>
The foam in both of my headsets has also deteriorated but the QZPRO
cushions do not come with replacement foam. My next step is to find
a source for that foam.
For the benefit of others, the earphone cups of the CM-500 are
98.4 mm (3 7/8") x 93.6 (3 11/16") - a standard 100 or 105 mm
(round) headphone pad should work. However, since the screws
holding the headphones together are located under the cushions and
the cushions are clamped between the face and cup of the headphones,
cushions with built in foam screens will not work.
The foam screens are 80 mm (3 1/8") x 60 mm (2 3/8") and are
fixed to the face of the headphone with double stick tape. One
could probably use 98 x 93 mm foam and simply slide it between
the earpad and the face of the headphone after the earpad has
been replaced.
73,
... Joe, W4TV
On 5/2/2023 12:03 PM, Walter Underwood wrote:
Replacement ear pads are available, but the internal wiring is very
fragile.
I managed to get the replacements on, but broke a wire. After four
breaks and three re-solderings, there wasn’t enough wire left to work
with, so I bought a new headset.
The Koss UR-20 is the same headphone 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 (11/1/19) by Josh W6XU. These are the
ones I ordered.
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
This guy just glued on the new ones, which might be a safer approach.
http://n4cf.mdodd.com/cm500_pads.html
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
On May 2, 2023, at 7:24 AM, Paul Ecker <ecke...@gmail.com> wrote:
Realize this subject has been around before, most of postings in
archives
are dated. Does anyone have a good current source for replacement ear
covers for the Yamaha CM 500 Headset?
73 Paul w2eck
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