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Neat. I use plug in regulators here currently (VRT/saturable reactor line isolation transformers). Whenever I run 2-3 tube color sets it draws enough current to sag line voltage and cause under-scan (some near by industry also sags the line sometimes), and the transformers fix that.
Some tube Dumonts and early SS color Zenith and Motorola sets used those same regulating transformers in the original design.
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