Re: Replacement for Foam Filter for PDP 11/24

2021-09-05 Thread Matt Burke via cctalk 
On 04/09/2021 18:42, Rob Jarratt via cctalk wrote:
> Another query. The foam filter that sits in the front of my 11/24 CPU is
> clearly badly degraded and needs to be replaced. What do people replace this
> kind of stuff with? I guess it mustn't be too fine, this mesh seems quite
> coarse.
>  

I think the original is something like 30 PPI reticulated foam.

Matt

Re: Replacement for Foam Filter for PDP 11/24

2021-09-04 Thread Fritz Mueller via cctalk 



> On Sep 4, 2021, at 10:42 AM, Rob Jarratt via cctalk  
> wrote:
> Another query. The foam filter that sits in the front of my 11/24 CPU is
> clearly badly degraded and needs to be replaced. What do people replace this
> kind of stuff with? I guess it mustn't be too fine, this mesh seems quite
> coarse.

Hi Rob,

FWIW, I've used 3M Filtrete (‎FAPF-UCTF2PAMZ) for this application on an 11/34. 
 It seems I tighter weave than the old foam, but is designed for pretty high 
airflow and seems to work well.

It's about 1/8" thick, slightly compressible, easily cut to size w/ scissors, 
and adheres well to velcro hook tape.

   cheers,
 --FritzM.

Replacement for Foam Filter for PDP 11/24

2021-09-04 Thread Rob Jarratt via cctalk 
Another query. The foam filter that sits in the front of my 11/24 CPU is
clearly badly degraded and needs to be replaced. What do people replace this
kind of stuff with? I guess it mustn't be too fine, this mesh seems quite
coarse.

 

https://rjarratt.files.wordpress.com/2021/09/1124-front-panel-2.jpg

 

Thanks

 

Rob