|
Here are some of my thoughts. I would continue checking voltages around the 12BY7 against the values on the schematic. And I presume you have already changed out the capacitor supporting contrast control which hooks up to the 12BY7 cathode?
On the focus, I would first verify the small rectifier tube but it seems a little suspicious that you have changed out a flyback and are experiencing focus, possible boosted B+ problems, plus a brightness control issue. They could all be related to not having correct boosted B+ which originally comes from your new flyback. If I recall the the crt screen grids are ultimately sourced from this same voltage. You did say the screen grids were showing the correct voltages? I agree with the prvious poster to check boosted B+ with a fine tooth comb.
Your picture tube looks really nice and you have done a lot of good work so far.
|