[TinCanAlley]

I watched the video. Some interesting content. I've tested my CRT with 2 separate testers and each one shows it good. While I can't get a red or green line, I can get a faint blue line. However, if I do greyscale outside of the setup with a greyscale ramp, I can get very strong colors from each gun and good brightness. The thing I haven't been able to figure out is the gain taps. I understand they work through a series of resistors to help remove color from the white parts of the picture. If I am understanding the schematic correctly, if you pull the tap off, it disconnects the video output to the crt and that removes the 142V. So why, when I pull the red tap in setup do I get a bright red line and lose it when I put it back? Like I said, if I understand the schematic, why red line with 0V and no line with 142V

Rejuvenating is risky from what I understand. I don't want to run the risk of damaging the CRT.

There was one thing I didn't fully understand from the video. When he was reading voltage from each of the resistors, what exactly was he seeing that pointed to the CRT's blue gun? One side of all of them seemed to have the same 26xV and the other side of each had lower, with blue not matching what red and green showed. Not sure how that translates to a bad blue gun.