I am in the process of taking off the lenses to clean everything, I just got zapped adjusting the drive on one of the crts, going to be a little more careful from now on cuz it hurt real bad. Anyways I dont see the pots on the crts but they do have a drive adjust and screen adjust on them, I also found the convergence board with 18 adjuster knobs on it. The top row is labeled for the geometry of the screen, the bottom row is labeled R1180, R1181, etc... What exactly do these ones do, I'm hoping to fix the slight blurriness. I will take a picture of the tubes for you kc8adu next week sometime, I need to wait for payday so I can get a much needed digital camera. I would like to have a backup set of crts just incase.