Quite so, so it seems current understanding isn't right. However, if the 'low' speed duty is covered by Speed 1 and the old 'medium' and 'high' duties are covered by Speed 2, then I think it all fits. This proposal would also explain why several observers over the years have reported 'no difference' between the medium and high speed T4 tests on a later 2-speed system. Clearly one or the other and simply by replacing the resistor, Joe got things back to normal.
TC
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