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RE: So the patent says 43% when a 6L6 is used? nt

The article in Audio Engineering Nov. 1951 by Halfer and Keroes says 18.5% impedance (which is 43% voltage/turns).

https://www.worldradiohistory.com/Archive-All-Audio/Archive-Audio/50s/Audio-1951-Nov.pdf


The patent says 18.5%.
"18.5% being clearly an optimum value, for the particular tube for which the plot of Figure 6 was made."
https://patents.google.com/patent/US2710312A/en

As far as I know the Acrosound TO-300 was used in the original 6l6 ultralinear amplifier and it has the taps at 43%

Tre'
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