|
I think I would use a High voltage probe and actually check the High voltage and the focus voltage. Looks like you have a low focus voltage. I see the cataract on the crt, but you have a uniform out of focus picture. High voltage should be about 25KV and the focus should be around 5KV. If high voltage is low, the focus voltage will also be low. Check the focus control it should have a noticeable effect even if the glass is the issue. You may have a bad focus rectifier tube, or socket. I have also seen defective crt socket cause bad focus. The focus coil itself could be bad as well. You really need to know what the focus voltage is first.
Bill R
|