On 8/11/19 2:21 PM, Warner Losh wrote:


On Sun, Aug 11, 2019, 11:29 AM Alan Perry via cctech <cct...@classiccmp.org <mailto:cct...@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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