Removing PVA (Was: ADM-3A question)

[Alan Perry]

On 8/11/19 2:21 PM, Warner Losh wrote:
> 
> 
> On Sun, Aug 11, 2019, 11:29 AM Alan Perry via cctech 
> <cctech at classiccmp.org <mailto:cctech at classiccmp.org>> wrote:
> 
> 
> 
>     On 8/11/19 6:58 AM, Charles via cctech wrote:
>      > Anyway. I did a bit more Googling and discovered that plain water
>      > dissolves the PVA goop just fine. No need to use a lot of expensive
>      > alcohol which seems to be a less effective solvent anyway!
> 
>     Last Christmas, I removed the old PVA from a DEC VR201 for a Rainbow
>     100. On the advice of a website that I found, I bought butyl acetate
>     and
>     a long needle syringe for injecting it deep into the PVA.
> 
>     However, after I removed the seal around the glass/tube, the glass
>     practically fell off and most of the PVA came off in a sheet. I had
>     some
>     electronics grade isopropyl alcohol around anyway and I used that to do
>     a final clean of everything before reassembly and reseal.
> 
> 
> What did you replace the PVA with?

Nothing. Air. I think it was here that someone told me that a small CRT 
like the VR201 doesn't need PVA filling the gap for implosion protection.

alan

> 
> Warner
> 
>     So, if anyone in the Seattle area needs a bottle of butyl acetate ...
> 
>     alan
>