Transformer hookup for BOSOZ

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I am in the mids of building a BOSOZ . I'm having trouble following the wiring for the transformers on the 120Voltage side. In the article on building the preamp, Nelson states that blue and violet wires go to the "hot side of the AC" while the purple and grey goes to the "cold side". How do you determine which is which? On a polarized plug is the wider blade the "hot side"?
 
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