> In series would be for 230V operation. Incidentally I use a 
> completely different 
> transformer (single 230V primary) when I build this for 230V 
> operation as they are 
> very much cheaper.
does the transformer manufacturer provide a data sheet and if so does it state that the windings are suitable for paralell operation (you could also do 120V by using just one primary)?

have you tried replacing the transformer with another identical one in case the first one is faulty?


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