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I stumbled across this old post, and wanted to add some information. The first Emerson TV was the 545, which had a power transformer. The cheaper 571 had the hot chassis, with all of those 25Z6 rectifier tubes. The incoming AC is doubled to about 250, and is also rectified to give a negative 125 volts or so. This gives about 375 volts end to end, to supply the deflection circuits. For the next production of that chassis type, Emerson replaced the tube rectifiers with seleniums.
I wanted to add this information, in case anyone here gets to work on one of those old beasts. I have owned an early 571 for 40+ years!
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