[ohohyodafarted]

Hi Tom,
Thanks for the kind comments on the "The Craft of Picture Tube Rebuilding" documentary movie currently being shown on my web site. (link to my site below in the signature block)

The gun in the 19V can be replaced with a standard 21" roundie Delta gun. The gun was purchased from Southwest Vacuum Products (the company has ceased operations) The tube appeared to be a successful rebuild (at first) but it is now arcing in the gun area. It is possible that it has taken on some air, or that the gun was not sufficiently Knocked. The vast majority of these tubes which have an ultor ring similar to the 15GP22, are prone to having vacuum leaks. Some leaks are small enough that it takes about 30 days to damage the vacuum, others take longer and some still will loose vacuum within hours of rebuilding. If a tube of this type is holding vacuum prior to rebuilding, there is no guarantee that it will still hold vacuum after it goes through the rebuilding process. I have a suspicion that the act of relieving the vacuum on a non-leaker and then putting it in the oven and re-evacuating the tube, places such tremendous physical stresses on the tube's envelope, that even if it was holding a vacuum prior to rebuilding, it could develop a vacuum leak after rebuilding due to the physical stresses the rebuilding process places on the tube.

I have an agreement with the present owner to buy the tube you saw in the video, in it's present condition to use in the 19" Motorola set that I got at the estate sale this fall. Even if the tube doesn't work, at least I will have the correct tube installed in the set for display purposes.