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You might want to check ham-fests for a line isolation type Voltage Regulating Transformer (2 of my 3 came from one day at a ham-fest). I run my regular use sets on them. Those transformers put out a constant 117V or 120V (depends on vintage) line voltage as long as the input is somewhere between 80-160V. They are great at squelching line transients too...Ever had a fridge of the central air system kick on and cause a TV to 'bloom'?...A VRT will end that problem. Some neighbor sharing our pole transformer runs something that, when on, causes that blooming effect several times a minute so a VRT is essential here.
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