Vertical collapse. Am I just lucky?

tbbk

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So, of the last 15 or so monitors I have had on my test bench, 2 of them have went from working into a vertical collapse state while I was adjusting either the vertical size or vertical hold.

Is that really common or am I just lucky?
 
The pots go bad sometimes.

Speaking of which. I have a pile of Happ Powerpro power supplies that went bad after trying to adjust the 5v pot. They just died. No life at all.
 
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