CRT Rebuilding Video

[Yamamaya42]

Originally Posted by bandersen

All I can tell you is there are a few dozen plastic bins of gun assemblies at the museum in Ohio. Color vs. B&W, neck diameter, filament voltage/current I could not say.

Also, I opened a few bins and the contents were not promising. Some of the plastic bags the guns come it were open to the air. Many had loose powder in the bags. I think it was the getter material that had fallen out of the getter cup.

Now I ony looked in 3 or 4 bins. There are many more that may have better gun assemblies.

As for flare neck glass tubes. There was one full box of the diameter for something like a 10BP4. There remaining 20 or so boxes seemed to all be smaller diameter for newer CRTs. Like the 21FDP4 used in Predictas.

getter material + air = BAD!

[Electronic M]

Originally Posted by bandersen

All I can tell you is there are a few dozen plastic bins of gun assemblies at the museum in Ohio. Color vs. B&W, neck diameter, filament voltage/current I could not say.

Also, I opened a few bins and the contents were not promising. Some of the plastic bags the guns come it were open to the air. Many had loose powder in the bags. I think it was the getter material that had fallen out of the getter cup.

Now I ony looked in 3 or 4 bins. There are many more that may have better gun assemblies.

As for flare neck glass tubes. There was one full box of the diameter for something like a 10BP4. There remaining 20 or so boxes seemed to all be smaller diameter for newer CRTs. Like the 21FDP4 used in Predictas.

Color VS black and white is usually fairly easy to visually discern. Color usually has 3 guns arranged in a delta, except for later inline guns. There's basically always 3 heater cathode assemblies in color regardless of inline or delta so that's another easy identifier.

Originally Posted by Yamamaya42

getter material + air = BAD!

Almost certainly not in this case. The getter on an uninstalled gun is typically a solid chunk of metal. After installation it's "flashed" (induction heated to vaporization) and the vapor film that deposits on the glass is what forms the actual getter. As long as there's enough solid material present to flash it's probably fine if the surface has been exposed to air for a while. They certainly don't make new gun assemblies in a vacuum chamber. They're always in air until they go in a CRT. It's exposure to air after installation in the tube post flashing and cathode activation that's a problem for guns.