A TV picture is usually more revealling of a power filter's flaws. Try a used Tice Video Solo power filter--good bang for the money. A Tice power cord (PC3) will help with the picture if you can't get a hold of a Video Solo.
A one brick DeZorel would be even better.
http://www.dezorel.co.yu
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A one brick DeZorel would be even better.
http://www.dezorel.co.yu
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