[GreenKeys] Sound deadening foam

[John Nagle]

On 9/1/2011 6:16 PM, greenkeys-request at mailman.qth.net wrote:
> On 31 Aug 2011, at 9:41 PM, Dave Hunter wrote:
>
> Hi All:
>
> A couple of weeks ago, I started a thread about replacing
> the sound felt pads in my Model 15 teletype....
>
> Finally my search led me to Ebay item # 150637154645 a
> sound deadening closed cell foam product sold for car sound
> insulation. I am told this is also used for noise deadening
> in aircraft.
>
> It arrived today, and has worked very well. The old felt
> blankets peeled off easier that expected, and this new
> sound insulation stuck very well using its peel off
> backing. I used the old felt pads as a template to cut the
> new soundproofing. The entire process of removing what was
> left of the old insulation, cleaning, and replacement of
> the pads took about 1/2 hour...
>
> http://www.islandregister.com/phones/sound.jpg

    That makes sense.  The stuff I used was only about 1/8";
yours is heavier, and closer to the original.  But, of course,
I built my own brass and glass case, and it's more open than
the stock case so that people can see the works.

    The thin stuff won't have as much effect on low frequencies,
but the most annoying teletype noises are impacts.  Low
frequencies are more likely to get out through the base, which
is why the standard table has big rubber Lord mounts and the
Model 15 case is isolated from the print mechanism.

				John Nagle