Conrac CYA 17" Color Monitor

[old_tv_nut]

A high price was certainly justified for a tube with controlled phosphors. They would be affected very easily by contamination, so applying them without getting contamination from/to a mass production run for TV sets could be a difficult project; might involve wasting material and time due to cleaning equipment before and after, etc.

Also, developing the controlled phosphor in the first place could be a problem. I wonder if Conrac negotiated shipping controlled phosphors from a single batch to the successive tube manufacturers? Seems I recall stories about the existence of just three barrels of the controlled phosphors that were used for all tubes.

[rca2000]

Originally Posted by old_tv_nut

A high price was certainly justified for a tube with controlled phosphors. They would be affected very easily by contamination, so applying them without getting contamination from/to a mass production run for TV sets could be a difficult project; might involve wasting material and time due to cleaning equipment before and after, etc.

Also, developing the controlled phosphor in the first place could be a problem. I wonder if Conrac negotiated shipping controlled phosphors from a single batch to the successive tube manufacturers? Seems I recall stories about the existence of just three barrels of the controlled phosphors that were used for all tubes.

SO then--a garden variety 21FJ tube with sulfide phospors--would not be good enough here ?

And--has ANYONE_-seen one of these beasts still "in the wild"--today ?

[old_tv_nut]

Originally Posted by rca2000

SO then--a garden variety 21FJ tube with sulfide phospors--would not be good enough here ? ...

Definitely not a sulfide red, which was the most orange of any of the reds used over the years and moved significantly more toward orange at high beam currents. The rare-earth red is actually quite close to NTSC red, and mainly appears wrong in later sets due to the large color demod/matrix adjustment needed to compensate for the yellower sulfide green phosphor.