Sony KV-1710 horizontal osc

[radiotvnut]

I would not zap this tube unless you have access to a decent CRT tester and have confirmed that the tube is bad. Poor focus and a dim picture is indeed a symptom of a weak tube; but, can often be compensated for by adjusting the G2 and focus controls. I've also seen TV's with a good tube that simply needed focus and G2 adjustments after someone had misadjusted these controls.