Hello Guys
Have these Tube A51-588x Philips 20", that have good image and colors, yoke measure 2.3ohms and 49ohms, everything is normal except for some almost invisible vertical bars on the left side of the tube that appear suddely, the right side is perfect fine, already test 2 chassis into another tube and the chassis is fine.
Any clue what could be, photo attached.
Thanks
Marcos