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I agree with Steve. I have never seen any of the lower voltage doorknobs assockated with the focus or convergence circuits go bad, though I have had several of the 30KV doorknobs in 15" color sets fail. They did not hurt anything else when they failed, as the HV rectifier tube provides som isolation. But like the filament windings and convergence transformer, I now replace the 30KV doorknob with a "modern" one. There seem to be plenty of 30-40KV doorknobs available on ebay these days.
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John Folsom
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