[Opcom]

bleaching the 7WP4 projection CRT screen

Sorry for the ugly compression -only small files allowed.

Pages from the 7WP4 datasheet about how the tube face darkens, and what to do for removing the darkening (burn-in) from the screen of this projection CRT.

The CRT is placed face-up in a cone shaped implosion shield and four 250W heat lamps are shined on the face for some time. The risk of implosion is due to possible uneven heating of the tube.

I wonder if anyone has tried this on other monochrome CRTs. Aluminized types of course.

Just thinking of the many old green or amber computer CRTs and old picture tubes and R/G/B projection CRTs that have good emission but slight burns.