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burn-in and bleaching the 7WP4 projection CRT screen
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.
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Timeless Information for Retro-Tech Hobbyists and Hardware Hackers No Kowtow
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