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What is a phase inverter (splitter) and why should I use a balanced one?

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What is a phase inverter (splitter) and why should I use a balanced one?

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A phase inverter or splitter is the tube that keeps your power tubes ( in a push pull A/B type of amp ) running 180 degrees out of phase. This is necessary because in a push pull amp one tube creates the upper half of the sine wave while the other tube creates the lower half. One of the symptoms of an unbalanced phase inverter is that some notes will sustain very well where others will fall off or sound dead. In 99% of all guitar amps the PI tube is the closest preamp tubes to the power tubes and 99% of all A/B style guitar amps use a circuit that splits the phase inverter duties utilizing both triodes in this tube.

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