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What I do on Japanese market gear (VCRs mostly) and some vintage TVs is use a bucking transformer. They're basically heater transformers with the leads wired to form a bucking auto-transformer. You can get them in 6V, 12V, and 24V flavors. My line voltage is around 117V on average so I tend to use the 12V bucking flavor...My 12V bucking was originally wired as a boost but I simply reversed the 12V winding for bucking....no sense tying up a variac on a working unit.
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