Removing PVA (Was: ADM-3A question)
Alan Perry
aperry at snowmoose.com
Sun Aug 11 16:48:13 CDT 2019
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
>
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