|
Some blooming is part of the design of some sets.
Excessive blooming is often the symptom of a failing HV rectifier.... basically the higher the gun current the higher the HV current which causes marginal rectifiers to pass less HV. Less HV means darker picture, and also slower current in the electron beam which means bigger deflection because the slowed electrons in the beam spend more time in the influence zone of the yoke.
Other potential issues are bad H output and or damper, issues with the flyback, H Osc or power supply.
Some blooming is to be expected, and if the set is 50s or older you may want to set brightness for just slightly above the minimum for good viewing in a room with subdued lighting. Many sets that old would fall on their face if you asked them to make a watchable picture in the sun...
|