15GP22.... Good Evening Mr. and Mrs. America, and All the Ships at Sea . . FLASH!!!!

[jr_tech]

I would guess that perhaps most of the 15GP22s that need rebuilding are, in fact leakers.

jr

[andy]

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[ohohyodafarted]

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UPDATE 10/26 5pm

I just spoke to Scotty. The news is somewhat mixed. The good news is that the rebuilding of the guns with new cathodes appears to be very good. Emission is right up there where it should be. Equal to any standard delta gun used in conventional 21" roundie color tubes. A bit slow to warm up at this point but Scotty thinks that it may "wake up" as we use it.

However we did have one slight setback. Un-beknownst to us, the getters were too close to the inside of the neck glass. And when Scotty hit the getters with the RF bomber, the heat of the red hot getters caused bubbling of the neck glass. The tube is holding vacuum, but there is a chance that when the neck heats up from prolonged use, the heating of the glass from the filiments could cause the neck glass to crack and we would lose vacuum. If that should happen, the tube would not implode, it would just go to air and we would have to rebuild it all over again. This problem is easily correctable by adjusting the position of the getter rings on the gun so they are farther away from the inside wall of the neck glass. This will be done starting with the next rebuild.

I have instructed Scotty to put the tube on his test bench and apply 6.3 volts and let it run for several day non-stop to see if the neck glass will hold. There is no point in shipping the tube to John's house only to find out that when we run the tube for a prolonged period, and the neck glass gets good and hot, that it cracks. Scotty said that he has seen this go both ways. Sometimes the bubbles will cause the neck to crack, and sometimes it will hold. Really no way to tell without giving it a good heating.

But at least we know that the guns have what appears to be excellent emmission.

I will post more information as things develop

Bob Galanter and John Folsom
The 15GP22 Project