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Originally Posted by rca2000
Here is a question--likely for the "oldsters" here.
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Yo dude.
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......I am curious. Did this happen in TUBE sets? I know that if the shunt reg opened up, the HV could go over 30KV. or so. BUT ..was their any sort of tuning caps off of the plate ckt of the H-out tube, as in the SS sets--that could cause this??
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NO. In tube sets, regulator failure would simply let the no-load voltage float up to 30KV or so.
But the SS "safety cap" failures that literally cut the necks off CRTs
were utterly unheard of until they started happening.
Seems like that unlike a tube, the output transistor is a 'hard switch', capable of driving the "fly-back" spike ((from which the HV is derived) to far higher levels than a tube could possibly manage.