One thing I think is probably related is the CRT failed to power up the other day, after the repairs! As well, before the CRT initially failed with no image, the image produced was relatively clean and no ringing was present. This brings me to wonder if I did something wrong in my repairs or selected inappropriate caps? I compared ripple ratings on all caps and all were general use, not low ESR. There is only one low ESR cap on the board and I did not replace it as it was testing ok, we in circuit anyway.