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The sets are a good score: congratulations.
If the filaments are series string but uses a 5U4 for the B+, I wonder if the set would have a "hot" chassis? The hot chassis results in taking the B+ from the power mains directly and the power transformer would provide isolation. I am now curious to look at the diagram.
I suppose eliminating the filament power, there was the consideration of saving a bit of weight and cost with a smaller power transformer?
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