The single phase voltage is 110 V a . c . though having a " centre tapped Earth " reducing the voltage to Earth to 55 V a . c.
2.
For example, the 12BH7 ( double triode with separate cathodes ) counts the centre tapped heater as one useful element, whereas the 12BY7 ( pentode ) counts the centre tapped heater as two useful elements.
3.
For example, the 12BH7 ( double triode with separate cathodes ) counts the centre tapped heater as one useful element, whereas the 12BY7 ( pentode ) counts the centre tapped heater as two useful elements.
4.
As the anodes of each AC phase are fed from opposite ends of the centre tapped transformer winding, one will always be positive with respect to the center tap and both halves of the AC Waveform will cause current to flow in one direction only through the load.
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