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Power supply filter symptoms in 50Hz sets
I've got a mid-60's Sony that someone has replaced one of the 500uf filters with two 470uf in parallel at some point in the past. The set has a fairly pronounced hump about 2/3 of the way down the screen where it all bends to the left and then back. It occurs to me that since the power line frequency and the vertical sweep frequency are both 50Hz, it's likely that a filter-related bend like that won't crawl up the screen as it does on NTSC sets on 60Hz power.
Is that right? A bad filter will manifest as a bend that doesn't move?
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02-02-2020, 10:27 AM
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