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OK, Here's how we did it on a production scale in a tube rebuilding facility. You could put it in an oven but a lot of trouble and perhaps dangerous.
We had a special rack to hold it at about a 45 degree angle. We had a gas fired radiant heater, (the kind you hang from a ceiling in a commercial metal warehouse) place it facing about 18" or so at the front of the tube and heat the faceplate for about five minutes or so. This would heat the faceplate up quickly and when it was ready, would then take the tube (using thick gloves of course) and set it on a small wood table with a 12" or so hole in it with the neck down in the hole.
The faceplate is exposed and then we would take two wooden dowels about 1" in diameter and 6" long or so with about 34" of heavy piano wire (about 16-20 gauge or so) securely tied/wrapped/secured around the center of the dowels. You would start at the top of the tube away from you and using your knee would pull the wire through the bonding and this would quickly separate the glass faceplate from the tube depending on how hot you got the faceplate. The residue of the Dow bonding material would peel off from both the tube and faceplate. We also used a razor blade scraper to get it off faster.
The heater would be a little larger than the faceplate for even heating as you cannot heat parts of the face. Heating must be uniform to avoid breakage of the faceplate. Julian
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julian
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