Looking for Color CRT Advertisement

[Quadibloc]

I thought this ad ran many times iln Electronics in the 70s or 80s, but I can't find it now.
Basically, it's an advertisement for a color CRT tube that doesn't have a shadow mask, but it's limited to showing green, red, and yellow; no blue.
The display shown in the ad was round, the application was air traffic control.
The technology was beam penetration; the tube had two phosphors, and which one (or both) was excited could be changed by changing the voltage difference between the anode and cathode.

Anyone have a name for the company, so I can narrow my search?

John Savard

[Freddy1X]

Post by Quadibloc
I thought this ad ran many times iln Electronics in the 70s or 80s, but I
can't find it now. Basically, it's an advertisement for a color CRT tube
that doesn't have a shadow mask, but it's limited to showing green, red,
and yellow; no blue. The display shown in the ad was round, the
application was air traffic control. The technology was beam penetration;
the tube had two phosphors, and which one (or both) was excited could be
changed by changing the voltage difference between the anode and cathode.
Anyone have a name for the company, so I can narrow my search?
John Savard

Good luck with your quest.

Sorry I can't help with a name, but I do remember reading about this color
tube and it's method of selection. I would say late 70' was when I saw it.
Probably was in the magazine Radio Electronics or EDN new products section.

[Douglas Miller]

I'll also say that I heard about this type of CRT (word of mouth), and also in the late 70's. But I got the impression it was older technology and heavily used in the military. But, I could have misunderstood some details. I was working for a company that did small contracts with NASA Ames, so perhaps I mistakenly assumed the technology was related to government projects. I thought I remembered it being discussed in the context of fighter jets (demanding visibility requirements in a cockpit).